Many students didn’t realize the importance of study _______ they left school.

A.whenB.untilC.a(chǎn)fterD.unless

B

解析試題分析:句意:很多學(xué)生直到離開學(xué)校的時(shí)候才意識(shí)到學(xué)習(xí)的重要性。when 當(dāng)……時(shí)候;until 直到……時(shí)候;after 在……之后;unless 除非。根據(jù)句意可知,這里是直到……時(shí)候的意思,這里使用的句型是not…until,意思是直到……時(shí)候,才……。故選B。
考點(diǎn):考查連詞。

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