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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单项选择题
I put my book on the desk, but now it's gone. It （）.

A、 may be stolen
B、 must have been stolen
C、 must be stolen
D、 must have stolen
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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