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
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
I'm very busy （） for the exam now. Will you come again at some other time.

A、 to prepare
B、 to be preparing
C、 prepared
D、 preparing
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