单项选择题

The man showed the boy ______ he should play the piano.

A．what
B．when
C．which
D．how

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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

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

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