问题
My friend has returned from the UK. She ______ atOxford for four years, during which we communicated with each other on theInternet.
A:studied
B:has studied
C:had studied
D:has beenstudying
B:has studied
C:had studied
D:has beenstudying
正确答案是：
同类题型
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He has been working hard day and night, which, of course,his tiredness.
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