what are these keys (

问题描述:

what are these keys (
for 还是to

应用to
分析:the key to the bedroom(开)卧室的钥匙
key to... .的钥匙

希望对你有所帮助~~~欢迎追问但是老师说是Akey to是固定用法key可以表示钥匙、答案等应该选B