The touristsdidn’t stop to rest at each station because it ________ them down.A.had slowedB.would slowC.shouldhave slowedD.would haveslowed
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D解析本题考查的是虚拟语气，后面because引导的从句用完整的语句应该是becauseif the tourists had stopped at each station，it wouldhave slowed them down故选择D。