单项选择题

The work （） by the time you got there.

A、has been finished
B、had been finished
C、was finished
D、will be finished

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单项选择题

Remember （） your seat belt when the car is started.

A、to fasten
B、to have fastened
C、fastening
D、having fastened

单项选择题

They demanded that another experiment （）.

A、be made
B、would be made
C、were made
D、had been made

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