题目内容：

My parents say that ___(play) games too much is bad for my study.

优质解答

PLAYING,这个里面THAT之后是宾语从句,PLAYING GAMES TOO MUCH是宾语从句的主语.
这样有两种情况符合语法,TO PLAY或者是PLAYING.
前者表示目的主语,显然不适合,只能选PLAYING,伴随主语.
懂没?