单项选择题

There may be a need for retraining if you expect employees（）new technology.

A．using
B．use
C．to use
D．used

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单项选择题
In addition to economic considerations, there are other reasons（）people work long hours.

A．what
B．why
C．when
D．where
单项选择题
When I am away（）business, I contact my office every day by email.

A．with
B．of
C．on
D．to
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