Though the working mother is very busy she an hour every day to spend with her daughter.

问题补充：

Though the working mother is very busy, she an hour every day to spend with her daughter.

A. set out

B. set off

C. set about

D. set aside

答案：

A. set out

B. set off

C. set about

(答案→)D. set aside

解析：考查动词短语：A. set out 开始，B. set off出发，引发，C. set about开始，D. set aside放置一边，留出，句意：虽然这个工作的妈妈很忙，她每天留出一个小时和女儿呆在一起。选D。