My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A:studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man
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![My friend has returned from the UK.She ____at Oxford for four years ,during which we communicated with each other on the Internet A:studied B has studied C had studied D has been studying (这一题答案为什么是A According to statistics,a man](/uploads/image/z/14633364-12-4.jpg?t=My+friend+has+returned+from+the+UK.She+____at+Oxford+for+four+years+%2Cduring+which+we+communicated+with+each+other+on+the+Internet+A%EF%BC%9Astudied+B+has+studied+C+had+studied+D+has+been+studying+%28%E8%BF%99%E4%B8%80%E9%A2%98%E7%AD%94%E6%A1%88%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AFA+According+to+statistics%2Ca+man)
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