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
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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
单项选择题
Was it in 1969 ______ the American astronaut succeed ______ landing on the moon
A．when; on
B．that; on
C．which; in
D．that; in
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