问题补充:
(·辽宁高考)Doctors say that exercise is important for health, but it be regular exercise.
A. can
B. will
C. must
D. may
答案:
A. can
B. will
(答案→)C. must
D. may
解析:选C考查情态动词。句意:医生说,锻炼对于健康很重要,但是必须是有规律的锻炼。情态动词must表示“必须”,符合语意。
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