单项选择题

It is necessary that he（）us.

A、 help
B、 helps
C、 helped
D、 would help

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填空题
All the children（）(involve) in the school play last week.
单项选择题
The author’s main purpose in this article is to explain（）

A．business in a free market economy
B．business in a socialist economy
C．the rights of businesses
D．businesses’ activities
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