摘要：Both his parents look sad.Maybe they what’s happened to him. A.knew B.have known C.must know D.will know 答案:1.B 现在完成时主要强调过去发生的动作对现在造成的影响.或过去发生的动作还未结束.一直持续到现在或将来.重点在于对现在的?影响?.
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Both his parents look sad . Maybe they _____ what's happened to him.
[ ]
A. knew
B. have known
C. must know
D. will know
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B. have known
C. must know
D. will know
Both his parents look sad. Maybe they _ what's happened to him.
[ ]
A. knew
B. had known
C. have known
D. will know
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B. had known
C. have known
D. will know
Both his parents look sad. Maybe they what's happened to him.?
[ ]
A. knew
B. have known
C. must know
D. will know
查看习题详情和答案>>
B. have known
C. must know
D. will know
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