—The experiment is of particular importance.
　　　　—I see. We will carry on with it ________ we can get enough money.
A．unlessB．thoughC．whetherD．until
C
whether引導(dǎo)名詞性從句時(shí)，意為“是否”。若其引導(dǎo)狀語從句，意為“不論是否……”。
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