推荐回答(3个)
bitten的话用了被动态,说明了一个结果,没有说明对以后的影响。
Having been bitten的话这里是用了完成体,而且hving是现在分词形式,说明这个动作还将持续下去。在句中可以理解为从今以后他都决定 refused to deliver our letters unless we chained our dog。
从这句子上来看,两种填法都是可以接受的。
BITTEN TWICE是已经完成了的动作, 用SIMPLE PAST TENSE比较简单直接
因为有EVERYDAY, 用WATERED已表达了每天都要完成此动作, 如用上BEING的话意思就难以理解了
1题中,bitten也可以表示动作完成,而Having been done中Having有进行时的含义,与twice不符合
2题中,涉及状语从句的省略句有关知识,being wartered强调动作正在发生或者持续发生,与everyday矛盾,原句是unless they are watered everyday
在状语从句中,若主句主语和从句主语一致,可以省略从句中的主语和be动词
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