问题
选择题
I ___________ frustrated when I wasn’t sure of the correct answer. [ ]
A. may be
B. used to
C. used to be
D. use to be
答案
C
搜题请搜索小程序“爱下问搜题”
I ___________ frustrated when I wasn’t sure of the correct answer. [ ]
A. may be
B. used to
C. used to be
D. use to be
C