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Difficulty: HardCommas with Lists, Clauses, and Coordinate Adjectives

Although the software developers spent weeks refining the neural network's architecture; the unpredictable, complex, computer program crashed when exposed to the new dataset.

Which choice best punctuates the underlined portion of the sentence?

  1. A
    NO CHANGE
  2. architecture, the unpredictable, complex computer program crashedAnswer
  3. C
    architecture, the unpredictable complex, computer program crashed
  4. D
    architecture; the unpredictable, complex computer program crashed

Answer

architecture, the unpredictable, complex computer program crashed
The correct answer correctly places a comma after the introductory adverbial clause ending with 'architecture'. It also correctly places a single comma between the coordinate adjectives 'unpredictable' and 'complex' while omitting any punctuation between the cumulative modifier 'computer' and the noun 'program', and between the subject 'program' and its verb 'crashed'.

Step-by-Step Solution

1
Analyze the clause structure of the sentence.
The sentence begins with the subordinating conjunction 'Although', introducing a dependent adverbial clause: 'Although the software developers spent weeks refining the neural network's architecture'. This dependent clause must be joined to the subsequent independent clause using a comma, not a semicolon.
Semicolons are only used to connect two independent clauses, whereas a dependent clause must be followed by a comma when it introduces a sentence.
2
Evaluate the adjectives preceding the noun 'program' to determine if they are coordinate or cumulative.
The adjectives are 'unpredictable', 'complex', and 'computer'. 'Unpredictable' and 'complex' are coordinate because they can be reordered ('complex, unpredictable') and joined by 'and' ('unpredictable and complex') while retaining the original meaning. 'Complex' and 'computer' are cumulative because 'computer program' functions as a compound unit, and we cannot say 'complex and computer program'. Therefore, a comma must separate 'unpredictable' and 'complex', but no comma should follow 'complex' or separate 'computer' from 'program'.
Coordinate adjectives require separating commas, whereas cumulative adjectives and noun adjuncts do not.
3
Check the transition between the subject and the verb.
The subject 'program' should directly connect to the verb 'crashed' without any intervening punctuation.
A single comma should never separate a subject from its main verb.

Key Concept

Identifying introductory dependent clauses, distinguishing coordinate from cumulative adjectives, and avoiding incorrect punctuation between subjects and verbs.
Estimated Time:1m 15s
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Topics

Commas with Lists, Clauses, and Coordinate Adjectives

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