--I saw Betty go to Grandpa Li's home ju
题型：选择题
问题：
--I saw Betty go to Grandpa Li's home just now.
--Yes. She’s often seen _________ the old man with the housework..
A: help B. to help C. helps D. helped
题型：选择题
--I saw Betty go to Grandpa Li's home just now.
--Yes. She’s often seen _________ the old man with the housework..
A: help B. to help C. helps D. helped
缺失，余留牙正常，若设计
为基牙，则
舌侧基托边缘应该位于（）