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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单项选择题
The sales department of a company is engaged in（）the products and making profits.

A．selling
B．sell
C．being sold
D．having sold
单项选择题
No sooner（）than I realized I'd left the document at home.

A．have we sat down
B．had we sat down
C．we had sat down
D．we sat down
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