单项选择题

Someone must have left the tap on, ______the water was running over and flooding the bathroom.

A. for
B. therefore
C. moreover
D. however
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单项选择题
______are the Olympic Games held They______once every four years.
A. How soon; occur

B. How long; are held
C. How often; occur

D. How far; are held
单项选择题
Everyone hopes that we can do something to make things better, so we can’t help______under the stress.
A. but working
B. but to work
C. work
D. but work
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