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询问几道单选题,1.____ I'm mistaken,I've seen that man before.A unle

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询问几道单选题,
1.____ I'm mistaken,I've seen that man before.
A unless B If C because D provided
2.While crossing the mountain area,all the men carried guns lest they ____ wild animals.
A should be attacked B whould be attacked
1A unless=if .not.如果我没搞错的话,之前我见过那个人
2A lest 后用should而且should 可以省略如果我没记错的话
所有人在穿越山区时都戴上枪,以防被野兽攻击