The police still haven’ t found her, but they’ re doing all they ______ .

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问题 The police still haven’ t found her, but they’ re doing all they ______ .

选项 A、may
B、can
C、must
D、will

答案B

解析 do all one can为常见词组，意为“尽力”或“竭尽全力”。

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