【題目】There is no doubt _______ scientific knowledge is very important for teenagers.
A.whether
B.that
C.if
D.what

【答案】B
【解析】句意：毫無疑問，科學(xué)知識對于青少年來說很重要。whether是否；that引導(dǎo)賓語從句無意義，只起連接作用；if是否；what什么。句型：There is no doubt that……毫無疑問……。所以答案是B。

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