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Thepolicestillhaven’tfoundthelostchild,butthey’redoinga...

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問題詳情:

Thepolicestillhaven’tfoundthelostchild,butthey’redoinga...

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

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

【回答】

A

知識點:情態動詞

題型:選擇題