单项选择题

This company differs from others in that ______.

A．it publishes books only for children
B．it publishes books about people's pets
C．it uses computers to make up stories
D．it makes the young readers characters in the stories
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单项选择题
Not until last night ______ the news.
A．did I know
B．didn't I know
C．that I knew
D．had I known
单项选择题
It ______ for four days and it hasn't stopped.
A．is raining
B．has been raining
C．has rained
D．had rained
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