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单选题

A．Less than ten minutes.
B．About twenty minutes.
C．Half an hour.
D．Forty-five minutes.

参考答案B

解析: How much time do the man and woman have before they address the class?
【昕前预测】四项均表示一段时间，本题与时间有关，应重点关注对话中有关时间的表达。
【解析】男士说要计算一下时间，他们之前还有两组，意味着还有大约20分钟的时间来准备。显然，离他们做报告大约还有20分钟的时间，故选B。

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B．Because it broke down.
C．Because of the crowd outside a drugstore.
D．Because the traffic was heavy.

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单选题

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单选题

A．He'll start next week.
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C．He needs time to decide.
D．He wants his adviser's opinion.

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