1._many times,he finally understood it.

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1._many times,he finally understood it.
A.Told B.Having been told
2._time,the postman refused to deliver our letters unless we chained our dog.
A Bitten B.Having bitten
还有第二题如果用Having been bitten的话行么?
什么时候用Having done什么的啊?这个不大会用跟done也分不大清

第一题：句意为“被告诉了很多次,最后他明白了.”要用被动语态,而且是过去的过去要用完成时.A选项既不是被动语态也不是完成时,所以不能选.
第二题：这道题你貌似写错了吧,应该将time改为twice,这样的话才能通顺,而且应该选择A而不是B,其句意为“由于被咬了两次,邮递员拒绝帮我们送信除非将狗拴上.”
而having done 表示分词动作\状态先于谓语动词发生.
再问：被咬是限于拒绝发生的为什么不用having done呢
再答：因为主语是人 postman，人属于被咬，而不是主动咬谁。例如：Having bitten the postman twice, the dog must be chained. 此句主语为狗，主动咬人。

1._many times,he finally understood it. _many times,he finally understood it!A.Told B.Telling C.Havi Having been told many times,he finally understood it.Having Having been told many times,he finally understood it . _____ many times,he finally understood it.ks5u Having been told many times,he finally understood it. ___many times,he finally understood it.A、He is told B、Having Having been told many times,he finally understood it.这个句子中为什 ___many times,he finally understood it.A.Told B.Telling C.Ha ______many times ,he finally undertood it _many times,but he still made the same mistake. ___many times,he finallyy understood it A Told B Telling C H