it's a little cruel to lock them up and not let them enjoy explorat...答:首先not Let them 后面不加to ,原因是:涉及到动词不定式to的省略 感官动词和使役动词在主动语态中,不需要加to ,Let是使役动词中的一个,也就是你这句话中为什么Let后面不加to 。(get算是使役动词,但使役动词有很多:let,make,help,allow,have,require,motivate,get,convince,hire,assist,encourage...