单项选择题

The rapid expansion of cities during the Industrial Revolution created a housing crisis.

A．avoided
B．brought about
C．aggravation
D．started with
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单项选择题
After the ______ application is approved, the cyberspace should not be left untouched.
A．smog
B．blog
C．blob
D．blot
单项选择题
This legislation is critical to sustaining the business upturn.
A．crucial for
B．contrary to
C．objectionable for
D．averse to
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