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

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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
单项选择题
Medical accidents（）by drugs have attracted much attention in that country.

A．causing
B．to be caused
C．be caused
D．caused
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