【题目】I ______the paper before my lawyer explained the details to me.
A. signed B. had signed
C. signs D. has signed
在线课程【答案】B
【解析】
试题分析：考查过去完成时。句意：在我的律师和我详细说明之前我就已经签字了。由题中时间点可知是过去完成时，故选B。
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