Nancy didn't come to class last Monday. She contracted a serious illness.

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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.

If Nancy hadn't contracted a serious illness, she wouldn't have come to class last Monday.

If Nancy hadn't contracted a serious illness, she would have come to class last Monday.

If Nancy didn't contract a serious illness, she would have come to class last Monday.

If Nancy didn't contract a serious illness, she would come to class last Monday.

Giải thích

B. If Nancy hadn't contracted a serious illness, she would have come to class last Monday.