单项选择题

The students______ a well last spring. So far they haven't finished it.

A．dug
B．were digging
C．digging
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单项选择题
Her mother told her never to______ the study of English.
A．give out
B．give up
C．give back
单项选择题
It's careless______ you to do so.
A．with
B．at
C．of
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