In each of the following questions, four alternative sentences are given. Choose the correct one.
Correct answer: C. When the fact fails him, he questions his senses.
- A. When the fact failed him, he questions his senses.
- B. When the fact failed him, he questioned from his senses.
- C. When the fact fails him, he questions his senses.
- D. He will question his senses, when the fact will fail him.
Explanation
The correct answer is Option C. It uses the zero conditional, which is applicable for general truths and scientific facts. In zero conditional sentences, both clauses are in the present tense. Options A and B are incorrect due to tense inconsistency and awkward phrasing, respectively. Option D incorrectly uses the future tense 'will fail' after 'when', which is not appropriate in conditional sentences that denote general truths.
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