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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单项选择题
Why not look it ______ in the dictionary
A． at
B． for
C． up
单项选择题
There is ______ number of children playing on the playground.
A． /
B． a
C． the
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