问题
选择题
I think the telephone is the second _________ invention.[ ]
A. helpful
B. more helpful
C. most helpful
D. the most helpful
答案
答案：C
搜题请搜索小程序“爱下问搜题”
I think the telephone is the second _________ invention.[ ]
A. helpful
B. more helpful
C. most helpful
D. the most helpful
答案：C