单项选择题

I had just stepped out of the bathroom and was busily drying myself with a towel ______ I heard the steps.

A. while
B. when
C. since
D. after
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单项选择题
Professor Wang works in our city as a researcher. It will be two years since he ______ here.
A. left
B. stayed
C. came
D. lived
单项选择题
As soon as we got to the river bank, we ______ three groups and got down to planting trees.
A. divided into
B. separated from
C. were divided into
D. were separated from
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