问题
选择题
I’m into the video game, it’s hard to think of anything else. All my focus is on finishing 
the story line.
A．Unless
B．Once
C．Whether
D．Although
答案
答案：B
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I’m into the video game, it’s hard to think of anything else. All my focus is on finishing the story line.
A．Unless
B．Once
C．Whether
D．Although
答案：B