I found ______ hard to concentrate.

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问题 I found ______ hard to concentrate.

选项 A、this
B、that
C、it
D、what

答案C

解析 本题考查it充当形式宾语。it充当形式宾语时,句子中真正宾语是不定式结构:-ing分词或名词性分句。本题中, found的真正宾语是不定式结构to concentrate。另如:He made it clear that he didn’t want tospeak to me.(他清楚地表示不愿意跟我讲话。)
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