单项选择题

Only a student or two（）to clean the classroom after school.

A．are needed
B．need
C．is needed
D．needs

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单项选择题
-- The light in the office is still on. -- Oh, I forgot（）

A．turning it off
B．turn it off
C．to turn it off
D．having turned it off
单项选择题
So carelessly （）that he almost killed himself.

A．he drives
B．he drove
C．does he drive
D．did he drive
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