-When _________ the abacus _________?-In the sixth century by the Chinese people.[ ]A. is; inventedB

题目简介

-When _________ the abacus _________?-In the sixth century by the Chinese people.[ ]A. is; inventedB

题目详情

—When _________ the abacus _________?
—In the sixth century by the Chinese people.

A. is; invented
B. did; invent
C. was; invented
D. does; invent
题型:单选题难度:中档来源:同步题

答案

C

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