My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture.A.couldn't B.needn't C.mustn't D.shouldn't

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My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture.A.couldn't B.needn't C.mustn't D.shouldn't
My sister met him at the Grand theatre yesterday afternoon,so he_______have attended your lecture
昨天下午我妹妹在大剧院碰见了他,因此他【肯定没有】参加你的讲座.

A couldn't 没有
B needn't 不需要
C mustn't 不准禁止
D Shouldn't 不应该

这里根据句意可知,是(推测过去不可能发生的事情,用Couldn't have done),请记住!选A

下面补充一点供你参考,和答题无关（这题标准答案肯定是A）：
但是,也有人提出了该题已不符合现代英语,尤其是美国英语的实际使用情况,应当改进.目前有充分的资料证明mustn't have done也可以用来表示“推测过去不可能发生某事”.例如：
1．His absence mustn't have been noticed．（CGEL）他的缺席一定没有人注意到.
2．Mr．Green mustn'thave received my letter,otherwise he would have replied before now．格林先生一定没有收到我的信,要不然他在这之前早就回信了.

【英语牛人团】牛人倾情奉献,您的满意使我们最大的追求,感谢您的采纳!

A,应该是他不可能会参加你的演讲，据前半句判断

你好。答案是A
he COULDN'T have attended your lecture.
== It is impossible that he attended your lecture.

A
can't/ couldn't have done 根本不可能...
needn't have done 本没必要,,,,
must have done. 肯定已经.....(不要用mustn't have done.....)
shouldn't have done 本不该......

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