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        1. (2013·四川省樂(lè)山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them.
          A.while B.when
          C.a(chǎn)s D.before
          B
          選B 考查連詞。句意:學(xué)生們正在教室做游戲,這時(shí)一名持槍的男子進(jìn)來(lái)并對(duì)著他們開(kāi)始瘋狂掃射。連詞when意為“這時(shí)”,可接短暫性動(dòng)詞。
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