问题
选择题
______, none of these reference books was useful.[ ]
A. Relevantly
B. Gradually
C. Unfortunately
D. Punctually
答案
答案：C
搜题请搜索小程序“爱下问搜题”
______, none of these reference books was useful.[ ]
A. Relevantly
B. Gradually
C. Unfortunately
D. Punctually
答案：C