有以下问题求教： 1)The millions of calculations involved, had they b

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有以下问题求教：
1)The millions of calculations involved, had they been don't by hand, would have lost all practical value by the time they were finished. don't为什么用not? 2)The traffic problems we are looking forward to seeing _______ should have attracted the government’s attention.
A. solving B. solve C. solved D. to solve we are...solved The traffic problems 是什么从句？ 3）As their English teacher had gone back America, so as a result, they stayed only to learn French. 由于他们的英语老师已经回美国了，所以，他们只留下来学法语 to learn 是不定式吗？ 4. Concentrate you energy, thought and mind exclusively on the business in which you are engaged, hang on in there and be patient, for, as Emerson put it, no one can cheat you out of your ultimate success but yourself. Concentrate, thought and mind是动词吗？若是动词，后二者是同位语动词吗？
以上问题不清楚，希望老师解答，谢谢

解题思路：理解句子含义；分析句子结构和成分；掌握短语搭配；熟悉语法。
解题过程：
你好，答疑如下
1. 请核对原句，don't应为done更合乎逻辑。
2.C solved做problems的补语，二者是被动关系。 we are looking forward to seeing _______ 部分为that定语从句，修饰先行词problems，that做从句see的宾语，可省略。
3.是不定式做目的状语。
4.concentrate是动词，thought and mind是名词与energy一起做concentrate的宾语。
异议讨论。

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