单项选择题

When asked to ______ the age of the antique, you need to have a special knowledge of the history.

A．think
B．guess
C．tell
D．suppose
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单项选择题
The dispute over the border area reached a point ______ both countries had to resort to arms.
A．to which
B．on which
C．that
D．where
单项选择题
A．hearB．hearingC．heardD．to hear
A．hear
B．hearing
C．heard
D．to hear
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