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        1. You will fall behind others _________ you work hard.
          A. if                  B. when                C. unless
          C

          試題分析:句意:如果您不努力學(xué)習(xí),你就會(huì)落后。If如果;when當(dāng)……時(shí)候;unless如果不,除非。故選C。
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