问题
选择题
It is important _____. [ ]
A. to careful
B. to careless
C. careful
D. to be careful
答案
答案：D
搜题请搜索小程序“爱下问搜题”
It is important _____. [ ]
A. to careful
B. to careless
C. careful
D. to be careful
答案：D