单项选择题

Because of the complexity of the modem machine, most offices require secretaries ______.

A. to have specified training
B. specified in training
C. to train specifiedly
D. training specified
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It is a common theme in many science fiction stories that the world may one day be ______ by outer space invaders.
A. broken in
B. taken over
C. run over
D. filled in
单项选择题
Only in recent years ______ begun to realize the importance of Internet.
A. people have
B. have people
C. that people have
D. since have people
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