问题
选择题
It is an interesting story and one can't put it down _____ one has finished reading it.[ ]
A. after
B. when
C. since
D. until
答案
答案：D
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It is an interesting story and one can't put it down _____ one has finished reading it.[ ]
A. after
B. when
C. since
D. until
答案：D