—Your colleague’s spoken English is quite good，Amy.
—No wonder，as she________in the USA for two years.
A．workedB．has been working
C．had workedD．has worked
A

考查動(dòng)詞的時(shí)態(tài)。在美國(guó)工作了2年，是過(guò)去的事，故用一般過(guò)去時(shí)。
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