(2013·四川省樂山一模)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)來并對(duì)著他們開始瘋狂掃射。連詞when意為“這時(shí)”，可接短暫性動(dòng)詞。
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