15分请教个英语问题but this did not prove to be a problem. 上面这个句子助动词did可以用was代替么?变成but this was not proved to be a problem.如果不可以请问为什么?最好能够分解下原句成分,谢谢~

15分请教个英语问题but this did not prove to be a problem. 上面这个句子助动词did可以用was代替么?变成but this was not proved to be a problem.如果不可以请问为什么?最好能够分解下原句成分,谢谢~ 请教一个英语选择问题：Hello!______ Tom.How are you,Mike?A.I'm not B.This is C.That is D.I'm 有个小小的小小的英语问题请教下1.Tommy was very busy yesterday.He got up__7:10 in the morning.A .on B.before C .for D .about2.He had a little rest after lunch,___he worked very hard in class all day.A.and B.but C.or D.for不仅想知道 请教个英语短句 问个英语问题 James has just arrived,but i did not know问个英语问题James has just arrived,but i did not know he_ until yesterday.a.will come b was coming c had been coming d 请教 英语问题The ears of a horse are longerThe ears of a horse are longer than_________of a cow. A this B those C these D ones 请解释一下 向科技英语的大虾们请教个问题.加热炉方面的问题,其中有个rod mil plant 请教英语问题not、hardly和everyone的搭配?为什么选D,hardly不可以. 请教一些初级英语问题,有兴趣的来看看我要一个人回答全部以下的答案,回答全部给30分Have I made myself clear 这个英语怎么说?是不是可以翻译成:what's this in English 或者是:what do you call this in En 请教个问题；‘意向性’这个词是什么意思?求解 一道英语问题 ---- This book by Tony Garrison is of great use for our course.---- But I think his latest one is ______ worth reading.A.better B.more C.most D.very选什么 为什么 请教数学英语问题,求解答 老师,请教您个关于but作介词的用法. 有个小小的英语问题请教He left the room_____.A without to say something B with saying anythingC without saying something D without saying anything选择哪一个答案?其中包含什么样的语法规则. 请教2道英语选择题（关于定冠词的）1.____ doctors and ___ nurses should care for their patients.a..The,the b./,/ c.The ,/ d./,the2.Long long ago,there were very ____people in this place,but now it has become a town with a large populati 请教个线性代数,行列式的问题请教个线性代数,的问题 问个英语问题 that trumpt player was certainly loud. but问个英语问题that trumpt player was certainly loud. but i was not bothered by his loudness_by his lack of talent.a so much as b.rather than c.as d.than 弟子规的解释问题你好,请教个问题