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In fact, I wonder _________ my efforts were all in vain.
A.thatB.whichC.whyD.where
C

试题分析:考查宾语从句的连接词:句意:事实上,我想知道我的努力为什么会是徒劳。因为主句的谓语是wonder,应该用疑问词连接,which可以做主宾表,这句话不缺主宾表,where在哪里,不符合句意,选C。
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