All flights ______ because of the snowstorm,many passengers

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All flights ______ because of the snowstorm,many passengers could nothing but wait.
A.had been cancelled B.have been cancelled
C.were cancelled D.having been cancelled
请高手给个确切的答案,再为我详细的讲下,以下4个非谓语动词在什么情况下用,我老是搞不清楚,麻烦讲的详细点,我将感激不尽!

选A
很明显,后面用的是COULD,说明“很多旅客只能无奈地等待”这件事是过去发生的,那么造成这件事的起因--航班取消--也就只能用过去完成时
B是现在完成时,说的是现在而不是过去,所有不选
C是一般过去时,而这里的起因应该是过去的过去,所以也不选
D是一个从句,不适合该处句型

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