单项选择题

（） the baby fell asleep （）the room.

A．After; did the mother leave
B．Not until; did the mother leave
C．When; did the mother leave
D．Until; did the mother leave

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单项选择题
（）scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

A．As
B．While
C．For
D．Since
单项选择题
I had worked here （）you came here. But l shall leave for England（）.

A．before long; before long
B．before long; long before
C．long before; before long
D．long before; long before
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