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

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

A

解析試題分析:句意:句意:警察仍然沒有找到那個(gè)走失的孩子,但是他們在盡全力。all之后的they can(do)作為定語從句修飾先行詞all,其定語從句引導(dǎo)詞that已被省略。從句中can表示“能夠”,符合句意。may“可能”;must“一定”;should“應(yīng)該”,均不符合語境,選A。
考點(diǎn):考查情態(tài)動(dòng)詞

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