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
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
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
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The abacus was The abacus was invented in the sixth century
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