单项选择题

So many students ______ , the teacher threw the textbook in a fit of anger.

A．were absent-minded
B．be absent-minded
C．been absent-minded
D．being absent-minded
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单项选择题
Nancy was surprised that they have ______ . They seemed to be a happy couple.
A．split up
B．broken down
C．fallen through
D．cut off
单项选择题
At present much more stress has been laid ______ law and order by the local government.
A．onto
B．at
C．on
D．to
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