单项选择题

The noise of the door ______ made me unable to go to sleep.

A．opening and closing
B．opened and closed
C．being opened and closed
D．having been opened and closed
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单项选择题
While discovering the cause of a disease, ______.
A．the best measures ought to be taken at once
B．the doctor should take the best measures
C．the disease should be treated right away
D．the patients should be properly treated
单项选择题
Time ______, we ll go to the Yellow Stone National Park.
A．permits
B．will permit
C．permitting
D．permitted
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