问题
选择题
Keys ______ used for ______ the doors. [ ]
A. is, opening
B. is, opened
C. are, opening
D. are opened
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Keys ______ used for ______ the doors. [ ]
A. is, opening
B. is, opened
C. are, opening
D. are opened
答案：C