Doctors say that exercise is important for health, but it ______ be regular exercise.

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问题 Doctors say that exercise is important for health, but it ______ be regular exercise.

选项 A、can
B、will
C、must
D、may

答案C

解析由句意可知这里应该用肯定的语气，故选C。句子意思是：医生说锻炼对健康很重要，但必须经常锻炼才有效。

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中学英语

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