【题目】--- Has your wife come back from Africa?
---Yes, but she _____here for only one month before she went on another expedition to Cuba
A. has been B. was C. will be D. would be
在线课程【答案】B
【解析】
试题分析：考查时态;句意是：你妻子从非洲回来了吗？--是，但在公司派她去古巴考察之前，她只在这儿呆了一个月，说明在这儿去古巴考察之前，也就是过去时间，故选B项。
考点 : 考查时态