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【题目】I ____ a tour guide for 7 months.

A. became B. was C. have been D. have become

【答案】C

【解析】句意:我当导游已经7个月了。一方面,有时间状语for 7 months可知,是表达到目前为止的时间,用现在完成时态;另一方面become是非延续性动词,不能和表示一段时间的状语连用,故答案选C。

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