There is no doubt _______ nearsightedness is a serious problem among the youth of our country.

A. / B. which C. whetherD. that

 

D

【解析】

試題分析：句意：毫無疑問近視在我們國家的年輕人之間是個嚴(yán)重的問題。There is no doubt that…毫無疑問…，doubt后面是同位語從句，因為是沒有懷疑，所以后面是肯定的，用that，如果是There is doubt后面用whether連接同位語從句。選D。

考點：考查同位語從句

 

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