问题
选择题
Yesterday Frank worked deep into the night, this is the second time this week he's stayed up, ____ ? [ ]
A. didn't he
B. isn't it
C. isn't this
D. hasn't he
答案
答案：B
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Yesterday Frank worked deep into the night, this is the second time this week he's stayed up, ____ ? [ ]
A. didn't he
B. isn't it
C. isn't this
D. hasn't he
答案：B
