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9.You will be out of date ______ you keep on studying from time to time.(  )
A.untilB.althoughC.orD.unless

分析 除非你不断地学习,否则你会落伍的.

解答 答案:D;until直到;although虽然;or或者;unless除非;根据句意"you keep on studying from time to time你不断地学习"是"You will be out of date你会过时的"的条件,而且是否定的条件;unless引导条件状语从句,=if not,意为"除非";故选D.

点评 了解每个选项的含义是做好此类题型的关键,还要从句意着手,根据句意作出解答;所以,平时的学习中要多进行积累词汇,才能很好的完成.

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