一般过去时和现在完成时时间状语北京西城区一摸题28.—Hi,Nancy ,I didn’t know you had c

一般过去时和现在完成时时间状语
北京西城区一摸题
28.
—Hi,Nancy ,I didn’t know you had come back .So have you graduated from college?
—Yes .I French for four years in Nanjing.
A．have studied B．had studied C．studied D．am studying
不是说有for+段时间作时间状语都得用完成时吗?
还是说没那么绝对,要具体问题具体分析.这里的4 years由题意可知是明确的过去的一段时间,故用一般时.