【題目】— Would you like to do it at all?
— I'd love to, but the question is _____it is worth doing.
A.if
B.whether
C.when
D.that

【答案】B
【解析】句意：你到底想不想做？我想做，但問題是它是否值得做。此處為表語從句，whether和if引導名詞性從句時，意為“是否”，但是引導表語從句時，只能用whether不能用if；when引導名詞性從句時，作從句的時間狀語，而在本句中句意不通；that引導名詞性從句時，只起連接作用，沒有漢語意思。故選B。

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