Bob ______hard, otherwise he ______this exam.

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问题 Bob ______hard, otherwise he ______this exam.

选项 A、must have worked.. . would fail
B、mustn’t have worked. .. wouldn’t fail
C、can’t work. . . wouldn’t have failed
D、can’t have worked. . . wouldn’t have failed

答案D

解析 句意“鲍勃不能努力学习,否则他不会不能通过考试”。前句情态动词引导的完成时态,后句过去将来完成时。
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