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急 英语语法题 请帮我选出答案

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急 英语语法题 请帮我选出答案
1.____in the past,at the moment it is a favorite choice for wedding gown.
A.\x05Unpopular has as white been B.White has been as unpopular 
C.Unpopular has been as white D.Unpopular as white has been
.____for a long time,the fields are all dried up.
A.\x05There has been no rain B.Having no rain  
C.There having been no rain D.There being no rain
Televisions enable us to see things happen almost at the exact moment____.
A.\x05which they are happening B.they are happening  
C.which they happen D.they have happened
急 英语语法题 请帮我选出答案
1.D
as 引导的让步状语从句要倒装
2.C
这是一个独立主格结构,There having been no rain 的完整结构是There has been no rain
主语是 no rain
两个部分因为主语不同 加之是主语+非谓语形式(可带宾语)故可以判断为独立主格结构;
使用完成时是强调未下雨对田野的影响.
3.B.
at the exact moment
在此作为连词,其后可以直接加;一个完整句子they are happening  
类似的还有 the moment / the minute / immediately等词
若去掉at 会更恰当些.
A.which they are happening 若把which改为when就是一个定语从句了.
选现在进行时的原因在于强调那个时刻的动作.
moment引导同位语从句这个说法是错误的,作为同位语从句必须是说明名词内容的,一般moment后也不加同位从,其后加同位从的名词有 information / news / ideas / suggestions etc.