【題目】— 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】考查賓語從句。賓語從句應(yīng)用陳述語序，排除A、C兩項(xiàng)，由答句In the 6th century. 可知，問句用過去時(shí)。所以答案是D

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