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问题: 2.一道单选题,请详细解释一下

My sister ______ until she was forty-five.
A. married B. didn't marry
C. was not married D. would marry

解答:

记住这是一个句型套路.

不怎么样...直到怎么样.. until 前一定是"否定"

was not married 放这里不通,所以 选 B. didn't marry