题目内容：
Don’t turn off the computer before closing all programs_______you could have problems．
A.or B.and C.but D.so
参考答案：
答案解析：
选择题：Don’t turn off the computer before closing all programs_______you could have ...
- 题目分类： 英语学科知识与教学能力
- 题目类型：选择题
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