单项选择题

Many a person ______ at the gate of the department store.

A. is standing
B. are standing
C. have been standing
D. have stood
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单项选择题
—Look at the noisy kids! —Haven't you heard the saying When the cat is away, the mice ______.
A. play
B. played
C. are playing
D. will play
单项选择题
From ancient times, the valley of the Nile has been made ______ by the river floods.
A. famous
B. deserted
C. attractive
D. fertile
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