说明理由1."We didn't see him at the lecture yesterday." "He____i

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说明理由
1."We didn't see him at the lecture yesterday." "He____it."
A.mustn't attend.B.cannot have attended
C.would have not attended D.needn't have attended
2.Man ____die without air or water.
A.will B.shall C.should D.would
3.Oh dear!What on earth ____ this mean?
A.should B.can C.may D.might
4.At the moment she ____ with her brother at home.
A.may play B.must be playing C.can play D.must have played
请选出答案,并说出具体的理由,

第1题选B,这是表否定的推测,其它选项无此意义.
第2题选A,这是表有科学根据的陈述,一般将来时的用法的一种.
第3题选B,具体理由我说不出来了～语感～
第4题选B,因为前面有个at the moment,这里应该译为“在现在这个时候”,应该用进行时.（当然有的时候,at the moment 是“当时”的意思,那就不一定用进行时了,如：At the moment,Tom had just been fired,so...当时,汤姆刚刚被解雇,因此...)

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