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

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热门试题

单项选择题

Time ______, we ll go to the Yellow Stone National Park.

A．permits
B．will permit
C．permitting
D．permitted

单项选择题

______, the laid-off workers started seeking another jobs.

A．All the money have been spent
B．All the money was spent
C．After they had spent all the money
D．Having been spent all the money