单项选择题

The laboratory technician often warns the trainees that they can't be（）careful in doing the experiment.

A．much
B．so
C．most
D．too

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单项选择题
No one is interested in that,（）

A．is one
B．are they
C．is he
D．isn't he
单项选择题
A dog was（）by a bus and killed.

A．turned over
B．knocked over
C．run over
D．got over
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