单项选择题

We have reached a point ______ a change is needed.

A．where
B．that
C．which
D．when
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单项选择题
A ______ talk is too long for those children.
A．two hours
B．two hour's
C．two-hour
D．two-hours
单项选择题
--Have your students ever seen the silent film --No, they are too young ______ the old film.
A．to seeing
B．have seen
C．to have seen
D．to have not seen
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