Mike is a student at a famous university, for a doctor degree.A. studiedB. studyingC. to

发布时间：2020-08-16 10:01:35

Mike is a student at a famous university, for a doctor degree.
A. studied
B. studying
C. to have studied
D. to be studying

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A. studied
(答案→)B. studying
C. to have studied
D. to be studying
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