两个选择题始终想不明白?1. I ___________ there in three years. A.went B. have been C. haven't been D. was2. She ___________ live abroad. A. has been to B. has gone to C. have been to D. went

两个选择题始终想不明白?1. I ___________ there in three years. A.went B. have been C. haven't been D. was2. She ___________ live abroad. A. has been to B. has gone to C. have been to D. went 始终想不明白英文是怎么写 伏安法里有两个电阻,改变一个电阻阻值,请问电源电压变吗?始终想不明白当另个电阻变后,另一个电阻也要变?怪怪的! Beijing is the place where i was born .和This is the house where i live in .请问这两个句子为什么第二个句子后面要接in 而第一个不用接?小弟始终搞不明白这个问题, 做一件事最重要是过程还是结果?如题 谢谢了始终想不明白 一道四川理综物理选择题关于弹簧的D两个选项好么,想不明白为什么速度最大的时候不是物体位移了Xo以后两个选项哦, 麻烦一下!帮我写英语选择题!英语选择题我有些不明白!希望大家多帮助我!谢谢!1.选择题.1.Anna is _______ to choose her own clothes. A.allowed B.allows C.allowing D.allow2.I took the wrong train _______,I didn't eve 月球始终只有一面对着地球,两个原因是___和____.其公转轨道是____形. 关于一道历史选择题 不明白>_ 英语高手请进,有几个选择题本人实在是想不明白1.Are there _____paintings on the wall? A.any B.a great many应该选哪一个,本人实在是搞不懂.2.My friends and I enjoy doing many of the same things. In that respect, we I'm out的同义句(3种）I'm out.1.___ ___ ___2.___ ___ ___ ___.3.___ ___ Do you mind ___ (I smoke)here?只有两个单词 1.He has (one) English lesson every day.对括号内的部分提问 ___ ___ ___ ___ ___ ___ ___ ___ .2.I can't decide which one I should buy.=I can't decide___ ___ ___ buy. 关于PN结单向导电的问题请问图中两个电路有什么异同点?A图中有一个PN结,加了反向电压电流是很小的,我始终想不明白.B图中有一个P型材料和N型材料,P型材料和N型材料分别都是良好导体,这样 1.一个平面过另一个平面的垂线,则这两个平面垂直.对于这个定理我始终搞不明白不会用它来证题,很是不爽,麻烦会的解释下!2.还有什么关于平面与平面垂直的判定定理吗?我感觉知道的太少了 英语冠词选择题,能者快进1.What shall we have for supper?I bought ___ big fish at ___ only marker mear my officeA a,a B a ,the C the ,不填2.Lily is coming by ___ plane tomorrow.Let's go to ___ airport to meet her.A a,a B /,a C the,the D /, 填空】Mr wang is our ___ teacher.|Let ___ help them.[两个横线里填选：I,China, 1.You can become a ___ ___ children who will ___ ___ ___ you.(你将成为崇拜你的小孩子的偶像) 2.I just want to ___ ___ ___ the date for next party .（我只是想提醒他下次联欢会的日期） 3.Can you ___ ___（组成） some sen