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The doctors are doing all that they ____...

The doctors are doing all that they _____, but the old man is still not breathing properly.

A.shall             B.need             C.may              D.can

 

D 【解析】 试题分析:考查情态动词:A. shall 将会,B. need需要C. may可以,可能D. can能够,句意:医生在做他们能做的一切,但老人还是不能正常呼吸。选D。 考点:考查情态动词用法
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6.  .

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