问题
选择题
I'm tired out. I stayed up the whole night, ______ for my midterm math exam. [ ]
A. studying
B. to study
C. to be studying
D. studied
答案
答案：A
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I'm tired out. I stayed up the whole night, ______ for my midterm math exam. [ ]
A. studying
B. to study
C. to be studying
D. studied
答案：A