Mum couldn’t find any help and had to do the housework.A. sheB. herC. hersD. herself

问题补充：

Mum couldn’t find any help and had to do the housework.

A. she

B. her

C. hers

D. herself

答案：

A. she

B. her

C. hers

(答案→)D. herself

解析：妈妈不能找到任何帮助，那么只能靠她自己做家务活，妈妈为第三人称，应该是她自己，herself是她的反身代词，故选D。