There is no doubt _______ nearsightedness is a serious problem among the youth of our country.
A．/ B．which C．whetherD．that
D

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。
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