20. The flu is believed________by viruses.A．causing B．being caused C．to be cause

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20. The flu is believed________by viruses.

A．causing

B．being caused

C．to be caused

D．to cause

答案

解析

略

举一反三

21._____by a desire to learn, he was not interested in children’s play and adventure when he was young.

A．Driven

B．Driving

C．To drive

D．To be drive

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Although she managed to buy some medicine, the instructions on the bottle really made her .

A．confusing; confused	B．confused; confused
C．confused; confused	D．confusing; confusing

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--- Why are the students working so hard these days?
--- ready for the coming entrance examination.

A．To get

B．Get

C．Getting

D．Got

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We had an anxious couple of weeks ______ for the results of the experiment.

A．wait

B．to be waiting

C．waited

D．waiting

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The teacher suggested English from time to time every day.

A．having read

B．us to read

C．our reading

D．being read

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