I used to frustrated when I wasn't sure of the correct answer.翻译

I used to frustrated when I wasn't sure of the correct answer.翻译 I——frustrated when I did not know the answerA may beB used toC used to beD use to be请给我具体的解释 i was so frustrated and even began to wonder ofife I was frustrated desperately. I used to be I used to 翻译 i am used to.. Frustrated 《I was frustrated desperately》是什么意思 I am very frustrated with not being able to see you as I would like to as well.如何翻译, somebody that i used to I used to be happy i am used to my I'm used to it. I get used to myself I'm used to loneliness . I am used to lonely I used to wear..My hair used to be....I used toI used to wear..My hair used to be....I used to watch...I used to play...I used to be五个句子各造一个句,