Children found the lecture so hard _____...

Children found the lecture so hard _______that they felt sleepy.

A.to be understood B. to understand

C. understood D. to understand them

B 【解析】试题分析：句意：孩子们发现演讲太难以理解，他们感觉要昏昏欲睡。这是find sth+形容词+(for sb)to do 句型。因为这个句型，不定式to do 的逻辑主语是sb.只不过省略了for sb。不能用不定式的被动结构。故答案为B。考点：考查动词不定式。

考点分析：

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