6.现在分词的独立主格结构,比主句的谓语发生的早所以用完成式,又是被动的所以选D
7.在时间、条件、方式、让步等从句中主语和主句的主语一致可以省去主语把谓语变成doing或是done.once是连词A是独立结构不是主谓结构
12.report sb/sth doing 以前发生的事所以用完成式表过去
13.in spite of 引导让步状语从句,as引导原因、时间状语从句（放在句首）,as引导让步状语从句必须倒装
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