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"We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gentleman."在这句话里能不能直接用watch out one?for起什么作用啊?

题目详情
"We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gentleman."在这句话里能不能直接用watch out one?for起什么作用啊?
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答案和解析
你可以说Watch out!小心!,但是后面跟宾语的时候要加上介词for,这是固定搭配.