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—I’m going to the post office.
      you’re there, can you buy me some stamps?
A.BecauseB.WhileC.AsD.If
B

试题分析:考查连词:句意:--我要去邮局。如果你在那里,你可以帮我买些邮票吗?而D表示如果你在那里,while表示当…时候,表示“一段时间”所以选B。
点评:as与when,while都是引导时间状语从句的从属连词,含义都是"当……的时候"。但它们有区别:用when时,从句的动作可以与主句的动作同时发生,也可以先于主句的动作发生;用while时,从句的动作为一过程,主句动作与从句动作同时进行或在从句动作过程中发生;用as时,主句和从句的动作同时发生,具有延续的含义。
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