问题:
It is ____ asking Tom for help, for he is always the last to help others.
A.useful
B.helpless
C.helpful
D.useless
It is ____ asking Tom for help, for he is always the last to help others.
A.useful
B.helpless
C.helpful
D.useless
A.useful
B.helpless
C.helpful
D.useless
参考答案: