单项选择题

All their attempts to ______ the child from the burning building were in vain.

A. regain
B. recover
C. rescue
D. reserve
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单项选择题
According to the weather forecast, which is usually ______ , it will snow this afternoon.
A. accurate
B. precise
C. exact
D. perfect
单项选择题
You will never guess whom I ______ on the street yesterday.
A. ran over
B. ran out of
C. mn into
D. ran up to
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