“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
從時(shí)間上看，由于是昨天沒來開會(huì)，所以推測他生病也應(yīng)指昨天，故排除A和C。從語境上看，既然上文說 I’m not so sure，那么說明說話者對自己的推測沒有很大把握，故選D。
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