单项选择题

It is obvious that these small businesses are（）need of technical support.

A．in
B．on
C．with
D．to

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单项选择题
I'm sorry to tell you that the materials you wanted are（）.

A．taken off
B．put up
C．sold out
D．got off
单项选择题
I'd appreciate it if you could tell me how（）the machine.

A．operate
B．to operate
C．operating
D．operated
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