单项选择题

Some animals ______ well enough in that country.

A．have not protected
B．is not being protected
C．arc not being protected
D．are not protecting
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单项选择题
He ______ the train if he hadn't been stack 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
单项选择题
It was not until dark ______ it was time to return home.
A．that he realized
B．that did he realize
C．when he realized
D．when did he realize
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