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题目
题型:不详难度:来源:
--When _____ the abacus _____?   -- In the sixth century by the Chinese people.
A.is, inventedB.did, inventC.was, inventedD.does, invent

答案
C
解析

此题考查的是被动语态,由be+过去分词。算盘是人发明的,它是动作的承受者。发明在过去,故用was invented,选C。
核心考点
试题【--When _____ the abacus _____?   -- In the sixth century by the Chinese people.A】;主要考察你对动词的被动语态等知识点的理解。[详细]
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