单项选择题

（）is often the case, one third of the workers have over-fulfilled the production plan.

A．What
B．This
C．That
D．As

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单项选择题
（）in a poor family, she is used to a simple life.

A．Born and breeding
B．Having born and bred
C．Born and bred
D．Being born and bred
单项选择题
The conference（）a full week by the time it ends.

A．must have lasted
B．will have lasted
C．would last
D．has lasted
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