单项选择题

A house with a dangerous gas ________ can be broken into immediately.

A．leak
B．split
C．mess
D．crack
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单项选择题
I waited for him half an hour, but he never________.
A．turned in
B．turned down
C．turned off
D．turned up
单项选择题
The work was almost complete when we received orders to ________ no further with it.
A．progress
B．proceed
C．march
D．promote
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