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“Why didn’t she come to the meeting yesterday?” “I’m not so sure. She ______ ill.”
A.should beB.should have been
C.must beD.might have been
D
从时间上看,由于是昨天没来开会,所以推测他生病也应指昨天,故排除A和C。从语境上看,既然上文说 I’m not so sure,那么说明说话者对自己的推测没有很大把握,故选D。
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