2. 外语
  3. It is well known that Tomas Edison ______ the electric lamp.

It is well known that Tomas Edison ______ the electric lamp.

admin2013-09-03  46
问题 It is well known that Tomas Edison ______ the electric lamp.
选项 A、discovered
B、found
C、developed
D、invented
答案D
解析
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