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

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答案：

D

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解析：

考查固定句型. Not…until…直到…才…句意;这是一个有趣的故事，直到完全读完以后才能真正理解它的意思。