(2010·遼寧高考)Doctors say that exercise is important for health, but it ________ be regular exercise.

Acan Bwill

Cmust Dmay

 

C

【解析】C 考查情態(tài)動詞。句意:醫(yī)生說,鍛煉對于健康很重要,但是必須是有規(guī)律的鍛煉。情態(tài)動詞must表示必須,符合語意。

 

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