They found the lecture hard ______.
A、
to understand
B、
to be understood
C、
to have been understood
D、
to have understood
【正确答案】
A
【答案解析】
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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