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    精英家教网 > 高中英语 > 题目详情
    The police still haven’t found the lost child, but they’re doing all they             .
    A．canB．mayC．mustD．should
    A
    本题考查情态动词。can表能力。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。”
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