I_________frustratedwhenIwasn'tsureofthecorrectanswer.[ ]A. maybeB. usedtoC. usedtobeD. usetobe

题目简介

I_________frustratedwhenIwasn'tsureofthecorrectanswer.[ ]A. maybeB. usedtoC. usedtobeD. usetobe

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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