英语高手们~帮我解道高三英语题~~All flights ____because of the terrible weather,they had to go there by train. A having been cancled B had been cancled C having cancled D were cancled --我需要详细解答

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英语高手们~帮我解道高三英语题~
~All flights ____because of the terrible weather,they had to go there by train.
A having been cancled B had been cancled
C having cancled D were cancled
--我需要详细解答啊～谢谢拉～
我也选B的~答案是A~是有关独立主格的~这个我一点都不懂哎~

选A,
两个独立的句子如果没有连词的话是不能出现在一句话中的.这句话中虽然有BECAUSE OF 但它连接的是第一分句的前后两个部分,而不是整句话.要使前一分句成为独立主格才符合语法,故排除C,D.
再来看独立主格,ALL FIGHTS 和 THEY 之间显然是被动,故选A.
看到句子不要慌,分析结构再作选择,其实没什么难的.

b
看后半句的时态,是过去时态
航班在他们趁火车前就取消了,过去的过去,过去完成时

A
本句是独立主格，英语规定一句句子不能有两个谓语动词，后半句的had是动词，前面半句就不能有动词了，排除B、D，前半句属于带有逻辑主语的独立主格，因为they不可能被取消，所以加个all flights

选B吧

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