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Someone is knocking at the door. It     my sister. It's time for her to be back.
A.can’t beB.may not beC.must beD.mustn’t be
C

试题分析:句意:有人在敲门。肯定是我的姐姐,这个时间她应该回来了。must be表示强烈的肯定推测,意为“一定是”,故选C
点评:情态动词是中考的热点,情态动词除了表推测外,还可以表达另外的意思,如must理解为必须,由这个词所开头的问句,肯定回答用Yes,you must.否定回答用No,you needn’t或者是No,you don’t have to.注意不用mustn’t,因为mustn’t表示例行禁止的含义。
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