Doctors say that exercise is important for health,but it__________be  regular  exercise .
A．canB．willC．mustD．may
C
動詞辨析。can 能夠，可能；will愿意，下決心；must 必須，一定；may 可以。句意：醫(yī)生說鍛煉對健康很重要，但是得下決心定期鍛煉。故選C。
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