Parents often have their children little housework so that they can have more time .
A. doing; studying
B. done; studied
C. to do; to study
D. do; to study
网友回答
A. doing; studying
B. done; studied
C. to do; to study
(答案→)D. do; to study
解析：考查固定结构。第一空 Have sb do sth.使/让某人做某事；第二空考查have time to do sth 有时间做某事。所以选 D。