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Difficulty: MediumClause Boundaries and Linking

For centuries, researchers have sought to understand the extraordinary durability of ancient Roman concrete, which has survived for millennia in harsh marine environments. Recent analyses reveal that the secret lies in hot mixing, a process that creates lime clasts capable of self-healing ______ water penetrates cracks in the structure, it dissolves these clasts to recrystallize and seal the gaps.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A
    , when
  2. B
    when
  3. ; whenAnswer
  4. D
    , but when

Answer

The correct answer is the option that uses a semicolon to separate the two independent clauses, stating '; when'.
The correct option uses a semicolon to separate the two independent clauses. The text before the blank ('Recent analyses reveal that the secret lies in hot mixing, a process that creates lime clasts capable of self-healing') is an independent clause, as is the text after the blank ('when water penetrates cracks in the structure, it dissolves these clasts to recrystallize and seal the gaps'). A semicolon is a grammatically correct way to join two independent clauses without a coordinating conjunction.

Step-by-Step Solution

1
Identify the clause boundary where the blank is situated.
The sentence contains two main parts: 'Recent analyses reveal that the secret lies in hot mixing, a process that creates lime clasts capable of self-healing' and 'when water penetrates cracks in the structure, it dissolves these clasts to recrystallize and seal the gaps.'
To determine the correct punctuation or conjunction, we must analyze the grammatical relationship between these two parts.
2
Analyze the grammatical structure of both parts.
The first part is an independent clause because it contains a subject and a verb and can stand alone as a sentence. The second part is also an independent clause, containing a subordinate clause ('when water penetrates...') and a main clause ('it dissolves...').
Correctly identifying whether the clauses are independent or dependent is necessary because joining two independent clauses requires a semicolon, a period, or a comma coupled with a coordinating conjunction.
3
Evaluate the options to find the one that correctly links the two independent clauses.
The option with the semicolon correctly separates the two independent clauses. The comma-only option creates a comma splice, the option with no punctuation creates a run-on, and the option with 'but' introduces an illogical contrast.
Only the semicolon meets standard English conventions while preserving the logical relationship of the sentence.

Key Concept

Clause Boundaries and Linking
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Topics

Clause Boundaries and Linking

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