单项选择题

The ball ______ two or three Times before rolling down the slope.

A．swayed
B．hopped
C．darted
D．bounced
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单项选择题
The mother didn' t know who______ for the broken glass.
A．blamed
B．be blamed
C．to blame
D．would blame
单项选择题
The fire was finally brought under control, but not ______ extensive damage had been caused.
A．before
B．since
C．agar
D．as
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