单项选择题

The most crucial problem any economic system faces is how to use its scarce resources.

A. puzzling
B. difficult
C. terrifying
D. urgent
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单项选择题
Evidently, he has made a big mistake this time.
A. Likely
B. Possibly
C. Obviously
D. Simply
单项选择题
The boy always looks through his homework before handing it in.
A. write
B. does
C. finishes
D. examines
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