单项选择题

Let's ask him for help, ______

A．don't we
B．shall we
C．have we
D．haven't we
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单项选择题
The house had one of its windows ______ in the storm yesterday.
A．breaking
B．to be breaking
C．broken
D．to be broken
单项选择题
When Mr. Green retired, his son ______ the business.
A．took up
B．took on
C．took over
D．took out
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