Parents often have their children little housework so that they can have more time. A. doi

问题补充：

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

答案：

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。