The police still haven't found the lost child, but they're doing all they ________.[ ] A. canB. mayC. mustD. should-高中英语-n多题

◎ 题干

The police still haven't found the lost child, but they're doing all they ________.

[ ]

A. can
B. may
C. must
D. should

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◎ 解析

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◎ 知识点

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◎ 相似题

与“The police still haven't found the lost child, but they're doing all they ________.[ ] A. canB. mayC. mustD. should”考查相似的试题有：

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