单选题
9.
Bob ______ hard, otherwise he ______ this exam.
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
【正确答案】
D
【答案解析】
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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