my math teacher is a awy是我的数学老师离开了的意思吗?????

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• it is 时间段和it has been时间 区别以前老师讲过,当时选择题里就是有一种用着更好,所以一定要某方面有区别的,不然两个的意思侧重点有不同吗?选择题里又冒出来了一个不太一样的,但是总之这个搞不明白很忧愁啊,现在的题目也顺便问一下,I won't forget my teacher because she ______ so kind to me since i came to this school.A.is B.was C.has been问为什么是C?如果回答得的真的很好,我可能会给多点分吧,I really need help!还有那个题目,it is+时间和it has been + 时间的区别?在回答一次吧?我想知道
• 1.eggplant,cabbage,1.I'm yummy to eat.my name begins with the letter as "tea".what am 2.my math teacher is very smart.my music teacher sings nice songs.they help us learn.they help us play.怎么译好些?有位朋友告诉我茄子和萝卜一个一个是没意义的，只有一斤，两斤这样才有意思，那么为什么苹果却有复数。
• my math teacher is a awy是我的数学老师离开了的意思吗?????
• 211×（-455）+365×455-211×545+545×365=_．
• 211×（-455）+365×455-211×545+545×365=_．