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
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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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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
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