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—The traffic is heavy now, so Mike       come late.
—Let’s wait ten more minutes.
A.canB.needC.mayD.shall
C

试题分析:can会;need需要;may也许;shall将要。句意:--现在交通拥挤,所以迈克有可能来晚。--让我们再等他十分钟。
点评:can表示推测时,多用于肯定句和疑问句。当用于肯定句时,指“有时可能会”,是理论上的可能,其时间意义宽泛不具体。例如:Even experienced teachers can make mistakes.
may / might表示推测时,用于肯定句,表示无把握的推测,意为“可能,或许”。 (might 比may 更加不肯定,更无把握)。例如:He may/might be writing a letter now.
即学即练:Food poisoning      cause death.
A.can                B.need             C.may             D.shall
解析:A 表示理论上的可能通常是用can,且可以用于肯定句中。句意:食物中毒可导致死亡。
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