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    Doctors say that exercise is important for health,but it__________be  regular  exercise .
    A．canB．willC．mustD．may
    C
    动词辨析。can 能够，可能；will愿意，下决心；must 必须，一定；may 可以。句意：医生说锻炼对健康很重要，但是得下决心定期锻炼。故选C。
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