单项选择题

______, strong periods in an economy give way to recessions, which has been justified by the data of the past two centuries.

A．Invariably
B．Permanently
C．Consistently
D．Unchangingly
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单项选择题
With the fast development and expansion of cities, the ______ suburbs of which become prosperous, too.
A．exterior
B．external
C．outer
D．outside
单项选择题
At that moment when he was told that the radio station had found his son for him, it was all he could do ______.
A．cry
B．crying
C．to cry
D．cried
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