单项选择题

案例分析题 （1）处应填写（）

A．build on
B．build up
C．build into
D．build out

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单项选择题
It was not until it got dark ______ working.
A．that they stopped
B．when they stopped
C．did they stop
D．that they didn"t stop
单项选择题
Mrs. White became a teacher in 1986. She ______ for thirty years by next summer.
A．will teach
B．would have taught
C．has been teaching
D．will have been teaching
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