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        1. ---- What are they doing?
          ---- Look, they ________ on the playground.
          A. are running      B. runs       C. is running
          A
          本題問句問的是現(xiàn)在正在做某事,所以回答語使用現(xiàn)在進(jìn)行時(shí),結(jié)構(gòu)為be+現(xiàn)在分詞doing,本題的主語為復(fù)數(shù),故be用are,故本題選A。
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