Lily is not good at math.She always has p____ doing math exercises.
问题描述：
Lily is not good at math.She always has p____ doing math exercises.
答
【problems 】 问题
Lily is not good at math.She always has 【problems 】 doing math exercises.
丽丽不擅长数学,她在做数学练习时总是有许多的问题.