Doctors say that exercise is important for health, but it _______ be regular exercise.
A．canB．willC．mustD．may
C

試題分析：考查情態(tài)動詞：A. can能 B. will將會C. must 必須D. may可以，句意：醫(yī)生說，鍛煉對健康很重要，但一定要是定期鍛煉。選C。
點評：情態(tài)動詞的詞義辨析要記清基本含義和一些特殊的用法，做題時要放在上下文語境中進行， 特別注意說話人的語氣。
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