单项选择题

The girl was heard ______ upstairs.

A． to sing
B． sing
C． singing
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单项选择题
My wife often forgets ______ the door, but she remembered ______ it when she left yesterday.
A． closing; close
B． closing; to close
C． to close; closing
单项选择题
Beijing is famous ______ its history.
A． in
B． for
C． on
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