三道英语语法题,1 、Not until the game had begun () at the sports gro

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三道英语语法题,
1 、Not until the game had begun () at the sports ground
A had he arrived B would he have arrived C did he arrive D should he have arrived
这题选几?为什么,麻烦一定要说下为什么,最好具体点
2、 This is top-secret work.In no circumstances () reveal what you know.
A you will B you can C do you D must you
这题为什么不选C 而选D?
3、How long ()?
A you suppose did it last B do you suppose it lasted C did you suppose it last D you suppose it lasted
这题选什么,我也选错了,麻烦教我下,

1.C.本题是not...until...句型的倒装结构（否定副词not提前放在句首）,原来正常的陈述语序是He didn't arrive at the sports ground until the game had begun.
2.D这道题也属于倒装句中的部分倒装结构,倒装的原因是题干中的第二句话是以in no circumstances（含有否定副词no）开首,所以采用部分倒装结构.
3.B.建议你做个就括号中内容提问的练习,就可以明白答案的来由了.I suppose it lasted (two hours),就two hours提问需要用how long,然后i suppose变为do you suppose,后面的宾语从句保持不变,即可得到题干的句子.
这个题目中的suppose跟think一样常用来表示个人想法H和观点,当做插入语来处理即可.
再问：两题懂了，还有个问题，第二题为什么选must you 而不是do you 呢？
再答：这句话明显有情态意义“必须”的意思，当然要选情态助动词must，而不能用一般现在时态的助动词do。
这句话如果转换成陈述语气，应该表述为This is top-secret work.You must not reveal what you know in any circumstances.(这是绝密工作，在任何情况下，你都绝对不能泄露出去）

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