You can hardly imagine the difficulty the single mum had ______ her children.

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You can hardly imagine the difficulty the single mum had ______ her children.

A. brought up

B. to bring up

C. bringing up

D. to have brought up

参考答案:

C答案为C。你很难想象单身妈妈抚养孩子的艰难。固定搭配have difficulty (in) doing sth.“做某事困难”。