—The experiment is of particular importance.

　　　　—I see. We will carry on with it ________ we can get enough money.

　　A. unless　　　　B. though　　　　C. whether　　　　D. until

C


解析:

whether引導(dǎo)名詞性從句時，意為“是否”。若其引導(dǎo)狀語從句，意為“不論是否……”。

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