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
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
单项选择题
There is something wrong with the computer. You'd better have it （）.

A、 repairing
B、 be repaired
C、 repaired
D、 to be repaired
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