Water be changed into vapour but it be heated to its boiling point . A. may ; canB. can

发布时间：2020-08-17 13:38:49

Water      be changed into vapour but it      be heated to its boiling point .
A. may ; can
B. can ; must
C. may ; needn''t
D. must ; may

网友回答

A. may ; can
(答案→)B. can ; must
C. may ; needn''t
D. must ; may
解析：can表示可能性，must必须，表示条件。
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