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
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单项选择题
There aren’t many pandas______in the world today.
A．alive
B．living
C．lively
D．lived
单项选择题
The shop assistant didn’t give me the right______.
A．change
B．money
C．service
D．note
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