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【题目】— 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

【答案】D
【解析】考查宾语从句。宾语从句应用陈述语序,排除A、C两项,由答句In the 6th century. 可知,问句用过去时。所以答案是D

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