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(wú)疑問(wèn)近視在我們國(guó)家的年輕人之間是個(gè)嚴(yán)重的問(wèn)題。There is no doubt that…毫無(wú)疑問(wèn)…，doubt后面是同位語(yǔ)從句，因?yàn)槭菦](méi)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(yǔ)從句。選D。
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