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They found the lecture hard .   A. to be understood B. to un

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They found the lecture hard .   A. to be understood B. to understand   C. for understanding
D to have been understood
They found the lecture hard .   A. to be understood B. to un
B.to understand 为正确选项.
这是find sth+形容词+(for sb)to do 句型.这里不能选A,to be understood,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.