单项选择题

Some animals ______ well enough in that country.

A．have not protected
B．is not being protected
C．are not being protected
D．are not protecting
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单项选择题
Mr. Yang, ______ for his famous invention, was invited to give a lecture in the technical university.
A．was known
B．knowing
C．was knowing
D．known
单项选择题
He ______ the train if he hadn't been stuck in traffic jam on the way to the railway station.
A．couldn't miss
B．wouldn't have missed
C．mustn't have missed
D．shouldn't miss
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