【題目】Many students didn’t realize the importance of study_____they left school.

A. when B. until

C. as D. after

【答案】B

【解析】句意：許多學生直到輟學后才認識到學習的重要性。when當……時候；until直到；as當……時候；after在……之后。not……until……“直到…….才……”,故選B。

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