题目内容
The fax machine, ______ accidentally, has increased the speed of delivering documents and brought great convenience to the business world.
A. was invented
B. being invented
C. invented
D. had been invented
| C |
| 过去分词表完成和被动的意义,invented accidentally作非限制性定语,相当于一个非限制性定语从句which was invented accidentally。 |
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