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

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单项选择题
They demanded that another experiment （）.

A、be made
B、would be made
C、were made
D、had been made
单项选择题
It is high time that we （） our own decisions.

A、make
B、made
C、to make
D、have made
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