以下四题，求详解，谢谢！
以下四题，求详解，谢谢！1.I（）tohimbecausehephonedmeshortlyafterwards.A.oughttohavewritten B....
以下四题，求详解，谢谢！1.I（ ）to him because he phoned me shortly afterwards.
A.ought to have written
B.must have written
C.couldn't have written
D.needn' have written
2.No longer are contributions to computer technology confined to any one country ,（ ）is this more true than in Europe .
A.hardly
B.little
C.seldom
D.nowhere
3.（ ）in the past,at the moment it ts a favorite choice for the wedding gown .
A.Unpopular has as white been
B.White has been as unpopular
C.Unpopular has been as white
D.Unpopulas as white has been
4.（ ）for a long time ,the fields are all dried up.
A.There has been no rain
B.Having no rain
C.There having been no rain
D.There being no rain 展开
A.ought to have written
B.must have written
C.couldn't have written
D.needn' have written
2.No longer are contributions to computer technology confined to any one country ,（ ）is this more true than in Europe .
A.hardly
B.little
C.seldom
D.nowhere
3.（ ）in the past,at the moment it ts a favorite choice for the wedding gown .
A.Unpopular has as white been
B.White has been as unpopular
C.Unpopular has been as white
D.Unpopulas as white has been
4.（ ）for a long time ,the fields are all dried up.
A.There has been no rain
B.Having no rain
C.There having been no rain
D.There being no rain 展开
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C 本不必做某事，但是做了
D对计算机技术发展所做的贡献,已经不再仅仅局限于哪一个国家,没有哪个地方能比法国更能证实它的真实性了.
nowhere就是说没有其他地方了C as 引导的让步状语从句 ，例如：Kid as he is ,he knows much.
A 独立主格结构
“独立主格结构”（absolute construction）又叫“独立结构”，是带有自己主语的非谓语动词分句和无动词分句。由于在语法上有自己的逻辑主语，结构上与主句不发生关系，因此传统语法叫做“独立主格结构”。
例如：Weather permitting,they will go on an outing to the beach tomorrow。
希望对您有所帮助。
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但是正确答案确实是dddc
追答
回答的着急了，您的答案是正确的，
1。D need't have done 本不必做但是做了
3.as引导让步状语从句，被强调部分必须提前 故答案 选D
4.独立主格，C
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