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.
1._many times,he finally understood it.
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