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We all understand that learning a foreign language ________ time and efforts.
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1年前
A: Are you online? B: Yes, I am reading a letter. A: How ___1___ do you use the Internet?
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I was a student from the countryside. My teachers thought I was the 小题1:________ student.
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一个同学在进行多边形的内角和计算时,求得内角和为1125°,当他发现错了以后,重新检查,发现少算了一个内角,问这个内角是多少度?他求得的是几边形的内角和?
1年前