问题
选择题
It is about 600 years ago ______ the first clock was made.[ ]
A. that
B. until
C. before
D. when
答案
答案：A
搜题请搜索小程序“爱下问搜题”
It is about 600 years ago ______ the first clock was made.[ ]
A. that
B. until
C. before
D. when
答案：A