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 in
C．need to
D．get well prepared

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单项选择题
(Who) (has eyes) can see (what great achievements) we (have made) since 1978．（）

A．Who
B．has eyes
C．what great achievements
D．have made
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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