单项选择题

Today, computers （）widely in the world.

A．are used
B．use
C．is used

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单项选择题
He wants to know how many boys （）are in the class.

A．here
B．there
C．those
单项选择题
My mother （）off the bike and broke her leg on the ground.

A．falls
B．was falling
C．fell
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