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        1. It's 5 days            we came here. Why shouldn't we start?
          A.whenB.beforeC.a(chǎn)sD.since
          D

          試題分析:句意:從我們到這里來已經(jīng)五天了。為什么我們不出發(fā)呢? A. When當(dāng)...時候B. before 在...之
          前 C. As如同,因為D. Since因為,自從。故選D。
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