单项选择题

The fire must have ______ after the staff had gone home.

A．broken down
B．broken up
C．broken out
D．broken off
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单项选择题
Careful surveys have indicated that as many as 50 percent of patient do not take drags ______ directed.
A．what
B．so
C．which
D．as
单项选择题
The background music in an assembly line is designed ______ .
A．being not listened to
B．not being listened to
C．to be not listened to
D．not to be listened to
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