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这句语法为什么是这样呢Sthwascausedbypeopleonlyofferingtheirservicestoahighbidder我不懂为什么offering用进行式?by后面不是接名词或动名词麽...

题目详情
这句语法为什么是这样呢
Sth was caused by people only offering their services to a high bidder 我不懂为什么offering用进行式?by后面不是接名词或动名词麽...
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答案和解析
这句话有省略
没省略的句子:Sth was caused by people (who are )only offering their services to a high bidder
这回没问题了吧