问题
选择题
John knocked at the door for nearly five minutes____his wife opened it.
A．when
B．before
C．until
D．as
答案
答案：B
搜题请搜索小程序“爱下问搜题”
John knocked at the door for nearly five minutes____his wife opened it.
A．when
B．before
C．until
D．as
答案：B