单项选择题

______ of them are doing homework at home.

A．Each
B．Both
C．Every
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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
There's a boy outside ______ is running across the road from that house.
A．which
B．who
C．that
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