dictionary复数形式

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• would you like some pears?--No,thanks.I think there ___ enough for usA.is B.are C,has been D.had beenc是不是应该改为have been因为pears 是复数,B也错了,因为要用完成时态请问,你觉得呢?
• 一条简便运算题1-{2/[1*（1+2）]}-{3/[（1+2）*(1+2+3)]}-```-{10/[(1+``+9)*(1+``+10)]},请大家先化成分数形式,再拆去括号,这样会更易明!记得要有过程（详细易明,最好用分数形式表示出来,尽量减少括号） 备注：我是名初一生
• I can see with them.改写成第三人称he,还有就是改写后,用不用把一些词改成适当的形式啊?那把I like toplay and have fun改写成改写成第三人称he,还有就是改写后,用不用把一些词改成适当的形式啊?
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• 无论是二元一次方程还是二元一次方程组都应该写成什么形式?
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• 一个数,除以3.5.7都余一,这个数最小是多少?
• 一个数除以3,4,5都余一,这个数是多少?