(·辽宁高考)Doctors say that exercise is important for health but it be regular exercise.

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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