The student must have been ill yesterday, ______?
A．mustn’t heB．needn’t heC．didn’t heD．wasn’t he
D
考查反義疑問句。must 表示推測時，要根據(jù) must 后的動詞形式來決定。根據(jù)時間狀語yesterday及been ill可知前文是對昨天的狀態(tài)進(jìn)行推測，故用be動詞的過去形式，選D。
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