单项选择题

They found the lecture hard ______.

A．to understand
B．to be understood
C．to have been understood
D．to have understood
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单项选择题
Because of my poor Spanish, I'm afraid I can't make myself ______.
A．understand
B．to understand
C．understanding
D．understood
单项选择题
... one or two free admission days at slow time. means
A．business is not bad
B．business is bad
C．strolling is slow
D．time is slow
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