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:考查情態(tài)動(dòng)詞。can表能力, may可能,可以, must必須,D. should應(yīng)該, do all(that)one can意為:“竭盡全力”。句意為:“雖然警察仍未找到那個(gè)失蹤的孩子,但他們正竭盡所能!边xA。
考點(diǎn):考查情態(tài)動(dòng)詞

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