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
The man showed the boy ______ he should play the piano.
A．what
B．when
C．which
D．how
单项选择题
—Did you see any foreigner present at the party—She was the only foreigner______ I saw at the party.
A．whom
B．that
C．who
D．which
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