2. 外语
  3. They found the lecture hard ______.

They found the lecture hard ______.

admin2008-11-13  25
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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