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Alice， why didn‘t you come yesterday?I _____， but I had an unexpected visitor.
A、had
B、would
C、was going to
D、did
【正确答案】：C
【题目解析】：当不定式在某些结构后作复合谓语时，不定式符号 to后的内容可以省略。常见的结构有：be able to，be going to，have to，ought to，used to等。