I _____ frustrated when I wasn't sure of the correct answer.[ ]A. may be B. used to C. used to

题目简介

I _____ frustrated when I wasn't sure of the correct answer.[ ]A. may be B. used to C. used to

题目详情

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
题型:单选题难度:中档来源:同步题

答案

C

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