I ____ here for four years,by next summer I shall have graduated.
I ____ here for four years,by next summer I shall have graduated.
A、shall study
B、have studied
C、shall be studying
D、have been studying
E、 
【正确答案】:D
【题目解析】:我在这里学习四年了,到明年暑假,我就(已经)毕业了。表示从过去到现在,并且会持续到未来,因此要使用现在完成进行时,have been studying。
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