The alarm clock didnt ring this morning. You______it last night.
A．need to have forgotten to wind
B．may have forgotten winding
C．ought to have forgotten to wind
D．must have forgotten to wind

未分类题As always, the downtown area was the busiest with people______in theatres, restaurants and department stores.A．crowdedB．crowdC．being crowdedD．crowding

未分类题______his number for an hour only to hear a busy signal, she became impatient and called the operator for assistance.A．DialingB．DialedC．Having dialedD．To dial

未分类题Not only______tolerant of other peoples opinion, but he is also patient.A．he isB．is heC．he will beD．will he be

未分类题There must have been someone who had informed the owner of the bathing center of the sudden crack-down or he______able to escape the sweep.A．wouldn't beB．wouldn't have beenC．might have beenD．needn't have been

未分类题The national parks are very important for preserving many animals, who would ______run the risk of becoming distinct.A．insteadB．neverthelessC．thereforeD．otherwise