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几道英语选择题,请说明理由

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几道英语选择题,请说明理由
1.I couldn't learn English well( ) he gave me sonme good advice.
A.if B.since C.unless D.until
2.This is a photo of the power that ( ) in my hometown.
A.has set up B.has been set up C.was set up D.is set up
3.----What has happened?
----The window ( ) but I haven't found out who ( ) it.
A.were;had been B.are;were C.were;have been D.are ;had been
4.I never thought of ( ) to see us.
A.Tom would be coming B.Tom come C.Tom coming D.Tom's come
理由啊,谢谢了
答案是1.D 2.B 3.A 4.C
但我想不通啊
几道英语选择题,请说明理由
1.D.not until表示直到.才.
2.B.对现在有影响,所以用完成时态;又因为是物作主语,固用被动语态.
3.A.第一空根据后文“I haven't been..."得用过去式,又最后一件事发生在第一空的事件之前,固用过去完成时.
4.C.介宾短语.用动名词.