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

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

A

解析试题分析:考查情态动词。can表能力, may可能,可以, must必须,D. should应该, do all(that)one can意为:“竭尽全力”。句意为:“虽然警察仍未找到那个失踪的孩子,但他们正竭尽所能。”选A。
考点:考查情态动词

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