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Thedoctortoldhimsmoking()harmfultohishealth.A.wouldbeB.willbeC.hasbeenD.is忘记说勒ABCD都讲明一下原因

题目详情
The doctor told him smoking()harmful to his health.
A.would be B.will be C.has been D.is
忘记说勒
ABCD都讲明一下原因
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答案和解析
D 这是一个省略that的宾语从句,因为吸烟有害健康是事实或真理,所以用is