the key to do和the key to doing的意思和区别
问题描述：
the key to do和the key to doing的意思和区别
demand to do和demand to doing的意思
答
the key to doing sth做.的关键the key to do很少用,但确实有这种结构.比如：I took out the key to unlock the door.(=I took out the key and unlocked the door.)我拿出钥匙打开了锁.不定式做目的状语...