单项选择题

The machines are made () at full speed.

A．work
B．working
C．to work
D．to be worked

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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

单项选择题As we have known from the map of the woad, this is ______.