【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】考查名詞性從句。此處為表語從句,whetherif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。句意:你到底想不想做?我想做,但問題是它是否值得做。故選B。

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