【gunman】...__agunmanenteredandbeganshootingwildlyatthem.A...

发布时间：2021-03-21 08:41:15

(2013·四川省乐山一模)The pupils were playing games in the classroom ________ a gunman entered and began shooting wildly at them. A．while B．when C．as D．before

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【答案】 B
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