单项选择题

We never dared to ask him a question,______

A．did we
B．didn’t we
C．dared we
D．daren’t we
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单项选择题
Lessons can be learned to face the future,______history cannot be changed.
A．though
B．as
C．since
D．unless
单项选择题
There aren’t many pandas______in the world today.
A．alive
B．living
C．lively
D．lived
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