Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Câu hỏi

Mark didn’t listen attentively to the lecture. He couldn’t answer the question.

A. If Mark hadn’t listened attentively to the lecture, he could have answered the question.

B. If Mark had listened attentively to the lecture, he could have answered the question.

C. If Mark had listened attentively to the lecture, he couldn’t have answered the question.

D. If Mark hadn’t listened attentively to the lecture, he couldn’t have answered the question.

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