In my opinion, ______ seems easy at first often turns out to be difficult in the end.

A. it B. what C. that D. which

B

【解析】

試題分析：考查主語從句。句意：在我看來，剛開始看起來很簡單的事情最后都會變得非常的困難。What引導主語從句，在從句中做主語，故選B項。

考點 : 考查主語從句

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