单项选择题

I ______ swim in summer when I was young.

A．used to
B．used
C．was used to
D．did used to
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单项选择题
______ Chicago is a beautiful city today, but ______ Chicago of the 1920s was a very dirty place.
A．The; the
B．/;/
C．A; the
D．/;the
单项选择题
If you want his address ,you will have to ______ the number in the book.
A．look into
B．look up
C．look through
D．look after
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