52单词网 > 高中英语 > 高中英语题库 > (2010·黑龙江省哈九中高三三模)26．----- As we know, you won’t go back to the USA since you ha

(2010·黑龙江省哈九中高三三模)26．----- As we know, you won’t go back to the USA since you ha

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(2010·黑龙江省哈九中高三三模)26．----- As we know, you won’t go back to the USA since you ha

（2010·黑龙江省哈九中高三三模）26．----- As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?

   ----- For almost 10 years．

A．did you study                 B．have you studied 

       C．were you studying             D．have you been studying

试题答案

A

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