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

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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.
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.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．

翻译：
你知道吗？ - 在6世纪。 A.谁是发明了算盘B. 你知道吗？ - 在6世纪。 A.谁是算盘发明B.当算盘被发明。当被珠算发明D.当算盘的发明

选D。这句话的含义是：你知道算盘是什么时候发明的吗？
这里后面的选项是用作宾语从句。疑问句中，从句的格式用陈述句语序。所以be动词要放在宾语前面。因为发明算盘这个动作是在过去发生的，所以从句要用一般过去时态。be动词要用was.

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