单项选择题

A lot of children at the school do not live in the town, but come in from () the countryside.

A．surrounded
B．surrounding
C．surroundings
D．surround

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单项选择题
The machines are made () at full speed.

A．work
B．working
C．to work
D．to be worked
单项选择题
Mr White, along with his assistants, () on the project day and night to meet the deadline.

A．work
B．working
C．is working
D．are working
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