问题
选择题
It is ____ asking Tom for help, for he is always the last to help others. [ ]
A. useful
B. helpless
C. helpful
D. useless
答案
答案：D
搜题请搜索小程序“爱下问搜题”
It is ____ asking Tom for help, for he is always the last to help others. [ ]
A. useful
B. helpless
C. helpful
D. useless
答案：D
=（）mm2/mm。