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Question

Difficulty: HardVerbs, Tenses, and Aspect

During the post-mortem analysis of the failed expedition, the team leader remarked, 'Supposing the severe blizzard ________ earlier than predicted, we would have reached the summit safely.' Which of the following options best completes the sentence?

  1. A
    did not strike
  2. had not struckAnswer
  3. C
    has not struck
  4. D
    would not strike

Answer

The past perfect verb phrase 'had not struck' correctly completes the sentence.
The sentence expresses an unfulfilled past condition (a third-conditional structure) introduced by the conjunction 'Supposing'. When 'supposing' introduces a past counterfactual situation whose result is expressed by 'would have + past participle' ('would have reached'), the condition clause must take the past perfect tense ('had not struck').

Step-by-Step Solution

1
Analyze the main clause structure and temporal framework.
The main clause 'we would have reached the summit safely' uses the perfect conditional ('would have + past participle'), indicating an unfulfilled outcome in the past.
Determining the main clause verb form establishes the required sequence of tenses for the conditional construction.
2
Identify the function of the introductory conjunction 'Supposing'.
'Supposing' functions like an 'if'-clause introducing an unreal or counterfactual condition.
When expressing past unfulfilled hypotheses, subordinate clauses introduced by 'supposing' follow third-conditional rules.
3
Select the appropriate verb tense to complete the third-conditional pattern.
The past perfect form 'had not struck' fulfills the requirement of an unfulfilled past condition paired with 'would have reached'.
Using simple past, present perfect, or modal 'would' in the hypothetical clause violates standard English aspectual and modal harmony rules.

Key Concept

Unreal Past Conditionals with 'Supposing'
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Topics

Verbs, Tenses, and Aspect

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