— Do you know _______?— In the 6th century.

题型：单选题题类：常考题难易度：普通

2016年新目标英语中考知能综合检测十九：九年级 Units 9、10

— Do you know _______?

— In the 6th century.

A、when is the abacus invented B、when the abacus is invented C、when was the abacus invented D、when the abacus was invented

举一反三

——Well, it depends on ______. If money isn't a problem, you can buy a BMW.

—Two. Tom will go with me.

—Yes, madam!

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