---Whatiswrongwiththecomputer?----Idon’tknow.Iwastyping...
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问题详情:
---What is wrong with the computer ?
----I don’t know. I was typing a letter ____the screen went blank
l B. before C. while
【回答】
D
知识点:连词
题型:选择题
标签:
Idon tknowIwastyping
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