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

試題分析：考查賓語從句的連接詞：句意：事實上，我想知道我的努力為什么會是徒勞。因為主句的謂語是wonder，應該用疑問詞連接，which可以做主賓表，這句話不缺主賓表，where在哪里，不符合句意，選C。
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