If he _ more careful, the accident wouldn't have occurred.
Correct answer: C. Had been
- A. Were
- B. Was
- C. Had been
- D. Would be
Explanation
The correct answer is 'had been' because it is in the past perfect tense, which is used to express an action that could have taken place in the past to prevent another event. In this case, being more careful in the past could have prevented the accident. The other options 'were', 'was', and 'would be' are in different tenses that do not fit the context of the sentence.
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Tenses show when an action or state occurs and whether it is complete, continuing or repeated. The work covers present, past and future forms, including simple, continuous, perfect and perfect continuous constructions, as well as sequence of tenses and the difference between tense and aspect.
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