题目内容
Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
A. before B. when C. since D. until
【答案】
A
【解析】略
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Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
| A．before | B．when | C．since | D．until |