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
Could I borrow your dictionary I left ______ at home this morning.
A．mine
B．my
C．me's
单项选择题
We will not go to the park ______ tomorrow is rainy.
A．because
B．when
C．if
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