我觉得选C.
首先,正如你所说,如果是A的话,应该还有for;
B.是形容词、此处作定语,排除；
若选择D,则句子就有两套主谓宾（而且,现在进行时一般表将来）except可以单独使用,但-ing形式表示期待中的、正在期待着……;
所以选C.是过去进行时.
【很久没看英语了,也不知道对不对、以上答案仅供参考啊,错了可不怨我……】
it was raining when Mary_____the bus
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