--When _____ the abacus _____? -- In the sixth century by the Chinese people.A
题型：不详难度：来源：
--When _____ the abacus _____? -- In the sixth century by the Chinese people.| A．is, invented | B．did, invent | C．was, invented | D．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。 |
举一反三
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A. will plant B. planted C. are planted |
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