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
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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
查看习题详情和答案>>
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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