问题补充:
Doctors say that exercise is important for health,but itbe regular exercise .
A. can
B. will
C. must
D. may
答案:
A. can
B. will
(答案→)C. must
D. may
解析: 动词辨析。can 能够,可能;will愿意,下决心;must 必须,一定;may 可以。句意:医生说锻炼对健康很重要,但是得下决心定期锻炼。故选C。
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