单项选择题

I don’t think a warm winter always has a negative influence on our life, hasn’t it

A．don’t think
B．has
C．on
D．hasn’t it
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单项选择题
Surely, there are lots of problems solving in our research so we need to get well prepared in advance.
A．lots of problems
B．solving
C．need to
D．get well prepared
单项选择题
Skating can be good for you （） correctly.

A．though doing
B．though done
C．if done
D．if doing
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