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Whilecrossingthemountainareas,allthemenhadgunsforproteciotnlesttheybythelocalbandits.a.beattackedb.wereattackedc.mustbeattackedd.wouldbeattacked麻烦说一下为什么

题目详情
While crossing the mountain areas,all the men had guns for proteciotn lest they __by the local bandits.
a.be attacked b.were attacked c.must be attacked d.would be attacked
麻烦说一下为什么
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答案和解析
lest以免,连词,后面所跟的是虚拟语气,故选A.(should)+原形动词