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英语
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He spends two hours doing his homework last night哪儿错了?
人气：253 ℃ 时间：2019-08-18 21:21:08
解答
spent 过去时
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He spent two hours doing his homework last night
He spends two hours a day doing his homework(用it作主语）It( )()two hours a day( ) ( )his homework
He spends two hours doing his home work与He spds two hours do his homework
He spends two hours a day doing his homework.
I spent two hours doing my homework last night的同义句
（1）当a=-1,-2,-3……时,分式1/a的值是怎样变化的?（2）a取怎样的整数时,分式6/a的值为整数?
描写微笑的好段
证明:对一切整数n,n2+2n+12不是121的倍数
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