The key you have just got the front door.
A. is used to opening
B. is used to be opened
C. is used to being opened
D. is used to open
网友回答
A. is used to opening
B. is used to be opened
C. is used to being opened
(答案→)D. is used to open
解析：词组辨析题，be used to do sth 用来做…；be used to doing sth 习惯于做某事。句意：你刚才拿到的钥匙是用来开前门的。结合语境选D