问题
选择题
I think the _____ invention is a mobile phone. What about you? [ ]
A. helpful
B. more helpful
C. helpfulest
D. most helpful
答案
答案：D
搜题请搜索小程序“爱下问搜题”
I think the _____ invention is a mobile phone. What about you? [ ]
A. helpful
B. more helpful
C. helpfulest
D. most helpful
答案：D