A
毕业为主动,B是被动形式,所以选A
A为现在完成时,句子i have been studying in this university for four years这部分为现在完成进行时,因此后半部分应该是by next summer i shall have graduated现在完成时
A
毕业为主动,B是被动形式,所以选A
A为现在完成时,句子i have been studying in this university for four years这部分为现在完成进行时,因此后半部分应该是by next summer i shall have graduated现在完成时