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4. In ____ the teacher and class began. A. come B. coming C. came D. comes
5. The little boy ____ himself ____ with a toy train.
A. filled B. contented C. covered D. played
6. Not until the early years of the 20 century _____ what computer was.
A. man did know B. man knew C. didn’t man know D. did man know
请老师翻译一下
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