单项选择题

The course comes in three books of case studies,（）a variety of business activities in different parts of the world.

A．being covered
B．covering
C．cover
D．covered

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单项选择题
If you leave your preparation（）the last minute, you’ll reduce your chances of passing the exam.

A．at
B．with
C．over
D．until
单项选择题
We are confident that we（）our export sales by 15 percent by the end of this year.

A．increase
B．had increased
C．would increase
D．will have increased
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