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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