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题型：单选题题类：易错题难易度：普通

While watching television, ____.

A、the doorbell rang B、we heard the doorbell ring C、there was someone knocking at the door D、the doorbell was ringing

举一反三

If someone spends his or her time, effort and money writing a book, for example, he or she deserves _______ for it.

Everything _______ into consideration, you will find that you'd better get well prepared ahead of time for the busy days _______.

Today there are more airplanes________ more people than ever before in the skies.

The long stick that the tubes were a{#blank#}1{#/blank#} to helped keep the old fashioned rocket moving in a straight direction.

I found it very refreshing to e{#blank#}1{#/blank#} ideas with your father — he has some very original views on how to deal with modern industrial pollution.

Three officials in the "Golden Rice" test on school children have been fired.

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