问题补充:
The student must have been ill yesterday, ?
A. mustn’t he
B. needn’t he
C. didn’t he
D. wasn’t he
答案:
A. mustn’t he
B. needn’t he
C. didn’t he
(答案→)D. wasn’t he
解析:考查反义疑问句。must 表示推测时,要根据 must 后的动词形式来决定。根据时间状语yesterday及been ill可知前文是对昨天的状态进行推测,故用be动词的过去形式,选D。
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