___such heavy pollution already,it may now be too late to clean up the riveA.Having suffered D.Suffered为什么选A...D不可以吗

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• ___such heavy pollution already,it may now be too late to clean up the riveA.Having suffered D.Suffered为什么选A...D不可以吗
• 过去分词作状语题目1._Seen_ (see) from the top of the hill,the city looks beautiful to us.（帮我解释下）2.The teach buildings _built_ (build) in 1960 need repairing.（为什么不是were built）3.I found my school bag _left_ (leave) in Mary’s room.（为什么不是had left）4._Lost_ in thought,he almost ran into the car in front of him.5__Having_suffered__ such heavy pollution already,it may now be too late to clean up the river.(这句是不是因为两个句子之间构成时间上的先后,所以要用过去完成时?）6.Don’t use words,expressions
• 分词作状语,尤其是它的时态问题,多拓展一下.1.__ the interview,the manager went to his office ,__ by the interviwer.A.Having finished ,followed B.Finished ,followedC.Finishing ,following D.Being finished ,being followed2._______ such heavy pollution already,it may now be too late to clean up the river.(01’全国夏)A.Having suffered B.Suffering C.To suffer D.Suffered
• 求救,能否详细地讲一下：动词不定式和分词做状语的不同.哪位高手帮忙讲一下,我一直搞不懂这点,谢谢～～～或什么时候用不定式做状语，什么时候用分词做状语还有，帮忙解释下这个问题：1. __________such heavy pollution already, it may now be too late to clean up the river.(NMET 2001) A.Having suffered B.Suffering C.To suffer D.Suffered 解析：答案为A。本题考查分词短语作状语的用法。分词作状语，其逻辑主语必须是句子的主语，而本句的主语看似是it,其实它为形式主语，真正的主语为不定式，而不定式省略了逻辑主语for people，所以应用现在分词，又因already，应用完成时。（不定式做主语，就必须用分词做状语吗？说明清楚道理，就是最佳，谢谢～～～）
• 请教changes in my hometown 怎么写?急用150字千万莫有错误啊1
• 过去我们城市没有污染 In the pass there ___ ____ pollution in our city.