问题
选择题
My best friend Gina studies very hard. She often studies very late every night, sometimes _____ 2 am. [ ]
A. at
B. until
C. before
D. to
答案
答案：B
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My best friend Gina studies very hard. She often studies very late every night, sometimes _____ 2 am. [ ]
A. at
B. until
C. before
D. to
答案：B