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        1. D

          解析試題分析:句意:你將會(huì)落在其他人之后,除非你努力學(xué)習(xí)。Until直到;when當(dāng)……時(shí);after在……之后;unless除非。結(jié)合句意只能選D。
          考點(diǎn):考查連詞。

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