英语的,请问,下面句子可以在 COSTS 后面加 TO 句子有错误吗?

问题描述:

英语的,请问,下面句子可以在 COSTS 后面加 TO 句子有错误吗?
Developing countries should try their best at all costs establish advanced laboratories for monitoring of quality

正确答案为:
要加to.
try best at sth 这里没错,
然后 establish 也是动词,那么就要用to来连接.