单项选择题

Only when we had finished all the work ______ that it was too late to take a bus home.

A．did we realize
B．will we realize
C．we did realize
D．we will realize
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单项选择题
Scientists should be kept ______ of the latest developments in their research areas.
A．inform
B．informing
C．informed
D．to inform
单项选择题
They will not start the project until the board chairman ______ back from South Africa.
A．will come
B．is coming
C．came
D．comes
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