单选题：Doctors say that exercise is important for health, but it __

题目内容：

Doctors say that exercise is important for health, but it _______ be regular exercise.
A．can
B．will
C．must
D．may

参考答案：

答案解析：

What is the message about?A.A meetingB.A vist to France.C.Th

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分类：英语题型：单选题

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分类：英语题型：单选题