Mountain climbing be tiring and many people feel sick as the atmosphere gets thinner.A. n

发布时间：2020-08-17 01:58:00

Mountain climbing      be tiring and many people feel sick as the atmosphere gets thinner.
A. need
B. can
C. must
D. would

网友回答

A. need
(答案→)B. can
C. must
D. would
解析：这里表示“推测”意思是可能，故用can。
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