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

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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
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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