问题
选择题
____ you don't work hard, you can't learn English well. [ ]
A. So
B. But
C. If
答案
答案：C
搜题请搜索小程序“爱下问搜题”
____ you don't work hard, you can't learn English well. [ ]
A. So
B. But
C. If
答案：C
平面的距离