这里为什么要用toeatat?Iamnotsurewhichrestaurant(toeatat).AtoeatonBforeatingCtoeatatDtoeatwith其它答案为什么不对?

Question

这里为什么要用to eat at?
I am not sure which restaurant (to eat at).
A to eat on B for eating
C to eat at D to eat with
其它答案为什么不对?

Answer 1

at restaurant意思是在餐馆,at which restaurant是说在哪个餐馆,然而在此为了避免头重脚轻,把疑问代词which提前,at放在to eat后面,实际上也可说成：I am not sure at which restaurant to eat.
at绝对不可省略,否则就成了“吃那个餐馆”.on和with和restaurant是介宾搭配错误.
for eating错误是因为一般用动词不定式做目的状语.