Playing computer games is delightful, but _______ (spend) too much time on it may do harm.

题目

Playing computer games is delightful, but _______ (spend) too much time on it may do harm.
用动词的适当形式填空

答案

spending
这里有but 所以 两个句子的动词形式要一样 平行原则
前半句用playing 这里就用spending