when did they invent the personal compwhen did they invent the personal computer?这个用被动语态怎么说?

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• when did they invent the personal compwhen did they invent the personal computer?这个用被动语态怎么说?
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• 选择题 1.They are talking about their plans ____the weekends. A.of B.on C.for D.at2.Her father has worked there ____two years.A.in B.for C.at D. to
• 补全对话Susan and Austin are talking about the coming school sports meeting ) A:Hi,Susan .why did the headmaster give you a speech?S：_________________________,and be good losersA：_________________________S：A good loser is someone who accepts that he or she has lost and does not make a fussA:I see .You will take part in the 100-meter running race ,won't you?S：yes,But you're not taking part in ._________________________A:I like sports ,but I feel too nervou