Do you know — In the 6th century.A.who is the abacus invente

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Do you know — In the 6th century.A.who is the abacus invented B.
Do you know — In the 6th century.A.who is the abacus invented B.when the abacus is invented C.when was the abacus invented D.when the abacus was invented

选D～～～～～～～～～～～～～算盘是什么时候发明的．
再问： was不用改成is吗？
再答：既然回答是在过去的时间里发生的．问句只能体现在谓语动词里了．所以用WAS
再问：不是有do吗
再答： when 引导的从句与主语是可以分开来的．　作从句的主语为算盘的句子是个被动句，结构为：be+Ved的形式

英语冠词Do you know ____ art in the 18th century played ____ mor 冠词好的进Do you know ____art in the 18th century played____ more Do you know the girl who is in the red dress?Do you know the The abacus was The abacus was invented in the sixth century 英语定语从句问题：Do you know who lives in the house————there is a bi Do you know A who is that man B who is the winner C who will ——Paul,do you know the man who is standing in our classroom? _____ do you know in the meeting room A who the other B who Do you know __?A.who the paper is invited B.who the paper wa Do you know who A.is the B.the boy is C.the boy(撇s) 英语翻译The 21st century is a century of information.As you know Do you know Australia? Australia is the largest island in th