单项选择题

It is high time that something ______.about the traffic problems in Beijing.

A. was done
B. will be done
C. should be done
D. should have been done
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Economics is beyond the ______ of a child's mind.
A. scope
B. range
C. phase
D. border
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I appreciate ______ the opportunity ______ abroad two years ago.
A. being given...to study
B. having been given...to study
C. being given...studying
D. having been given... studying
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