单项选择题

Sports and games can be （） great help to us.

A．of
B．at
C．on
D．in

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单项选择题
The factory has （） workers because of the drop in sales.

A．laid out
B．laid off
C．laid aside
D．laid down
单项选择题
He （） an old friend in the street the other day.

A．came about
B．came across
C．came from
D．came into
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