They found the lecture hard ______.

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问题 They found the lecture hard ______.

选项 A、to understand
B、to be understood
C、to have been understood
D、to have understood

答案A

解析动词不定式在difficult，easy，fine，hard，impossible，nice等形容词后出现的不定式只能用主动式。本题正确答案为A。

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英语

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