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
She was glad to see her children well ______ in the nursery.
A．take care of
B．taken care of
C．taking care of
D．to be taken care of
单项选择题
The machine is such ______ I have never seen before.
A．that
B．as
C．which
D．where
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