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

发布时间：2020-08-17 04:20:26

The doctors are doing all that they     , but the old man is still not breathing properly.
A. shall
B. need
C. may
D. can

网友回答

A. shall
B. need
C. may
(答案→)D. can
解析：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。
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