—Your colleague's spoken English is quite good, Amy．
— No wonder, as she              in the USA for two years．                  
A．workedB．has been workingC．had workedD．has worked
A

考查動詞的時態(tài)。Amy現(xiàn)在在中國，她在美國工作了2年，是過去的事，故用一般過去時。
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