请问是She has arrived there just now ?还是She arrived there just now? 请说明理由

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• 请问是She has arrived there just now ?还是She arrived there just now? 请说明理由
• Can you make sure_______?______Sorry,I can’t.But I did see her just now.But I did see her just now.不是“我现在才看到她”的意思吗?还是我翻译错了为什么不用过去完成时?不好意思，是我没把问题写完整题目-Can you make sure_______？-Sorry,I can’t.But I did see her just now.A.where did she go B.where she had gone C.where she has gone D.where will she go我选了B，为什么？I did see her just now我刚刚确实看到她了，不是去了已经回来了吗，怎么还是现在完成时不是过去完成时？
• 请问是She has arrived there just now ?还是She arrived there just now? 请说明理由
• Is it xiaohong who you spoke to just now?请问它的回答是yes,it is .还是yes,she is.
• Is it xiaohong who you spoke to just now?请问它的回答是yes,it is .还是yes,she is.
• 将句子改为一般将来时1.I've read this book.2.She's speaking to him now.3.He has been to the United States.4.YOU bought a house.5.They watched television.6.Jimmy has a lot of money.7.Joan has found her pen.8.Have you just been to the cinema?9.It is cold this year.10.Betty arrived at the airport at six in the morning.
• Where has our teacher___? She ___here just now. A.gone;has been B.gone;was C.been;has been D.been;w由于后面出现的时间是"just now",所以后面的空格应该是was.可以排除选项A和选项C,那前面那个空格呢?是gone还是been?求详细的解答.谢谢.
• 高一解三角形同向量结合的题目请大家务必给我完整一点的过程和思路~因为我不懂= = 【若您简略回答= =分就不能给了.】△ABC中,角A、B、C所对的边分别为a、b、c,且2sin^2 A+B/2（这个是连一起的,只要您写在纸上就明白我说的是什么了,我故意写的开点））+cos2C=1 【即 2sin^2A+B/2+cos2C=1】1,求角C的大小.2.若向量m=（3a,b）,向量n=（a,-b/3）,向量m⊥向量n,（m+n)·(m-n）=16,求a,b,c的值.（上题目第2问中m,n都是向量!“·”为数量积的点乘.）有思路点拨更好~我都想不出来的.特别是对解三角形这部分很不熟练,.（分、满意后就给的!）
• (1/2)对括号部分提问：1.She stayed there (for a week).2.I arrived (just