-We'll finish our middle school study in a few months.

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-We'll finish our middle school study in a few months.
-Yes,time files!Three years________________________.
A.is passing by B.has passed by
C.have passed by D.are passing by
-Kang Kang,how do you learn English so well?
-____watching English movies and try to repeat the actors.
A.In B.For
C.By D.On
以上2道我知道答案但不知道为什么,请用简洁易懂的语言详细解释一下.
看了现有回答,我还是很迷糊,能否详细讲讲每个选项呢?

第一题是完成时,站在现在看过去的中学生活,表示3年过去了
第二题是因为 by doing sth是表示依靠做什么而...,是固定用法

We study at a school _____(call)Shuren Middle School. Let's finish our homework in a few seconds,it's time we play Let’s finish our homework in a few seconds; it’s time we ___ 是study in a middle school还是study at a middle school? in the middle school,we students study Chinese ,math .physic We’re（）to study History in the middle school. We ___________[study] in 8 Middle school .Sinalle two years we are in our __years at no.1middle school 英语组词成句:in,a,here,near,I,study,middle,school(.) when he was twelve,he____(study)in a middle school. Our school is a key middle school in this city We'll have a music and dance show in our school hall next we