In spite of lots of _________ she has experienced, Mary is not thinking of herself as _________ and holds an optimistic attitude towards life．

A.failure; failure

B.failures; failure

C.failure; a failure

D.failures; a failure

答案及解析： D

解析：

这两个空中的failure都用作可数名词；

第一个空表示“失败的事”；

第二个空表示“失败的人”。