题目内容
看图完成对话
A：________ ________ the light bulb ________ ________?
B：It was invented by Thomas Edison.
A：________ ________ it ________ ________?
B：It was used for seeing in the dark.
答案：
解析：
解析：
|
Who, was, invented, by; What, was, used, for |
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