单项选择题

There is ______ number of children playing on the playground.

A． /
B． a
C． the
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单项选择题
If I get up too late, my mother will be angry ______ me.
A． with
B． at
C． about
单项选择题
______ of them are doing homework at home.
A． Each
B． Both
C． Every
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