单项选择题

No sooner had we finished the conversation （） we heard a knock on the door.

A. when
B. then
C. than
D. until

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单项选择题
One of the main problems in the city is （） pollution.

A. how to do away with
B. how can do away with
C. that to do away with
D. that how to do away with
单项选择题
Agriculture was a step in human progress （） which subsequently there was not anything comparable until our own machine age.

A. in
B. for
C. to
D. from
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