The natives, ________ homes had been damaged by the flood, were given help by the Red Cross．

A.all their

B.all of whose

C.all those

D.all of their

答案及解析： B

解析：

当句中出现逗号时，应判断是并列句还是复合句。若是并列句则应有并列连词;若是复合句，要么有从属连接词，要么有相当于从句功能的分词短语或独立主格结构等。该句中并无并列连接词，故排除A项；

C项为错误选项；

D项不符合句式结构的功能。若有并列连词，可以选D项。此处为非限制性定语从句，应选B项。