问题
选择题
There is no _____ that taking regular physical exercise is good for your heart.
A．need
B．sense
C．worry
D．doubt
答案
答案：D
考查句型：There is no doubt that 毫无疑问做某事，句意：毫无疑问定期参加体育锻炼对你的心脏有好处。所以选D。
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