If he _ in class, he would know the answer.
Correct answer: A. Had paid attention
- A. Had paid attention
- B. Paid attention
- C. Has paid attention
- D. Would pay attention
Explanation
In the given sentence, the structure suggests a hypothetical situation in the past where the completion of one action ('had paid attention') would lead to the result of knowing the answer. The correct tense to use in this context is the past perfect tense 'had paid attention'. The other options do not align with the structure of the conditional sentence and are therefore incorrect choices.
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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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