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

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 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 when i when i when i do还是when i doing when i am gone when i looking your when i looking your when I was young? I lost when time like when I see When I meet you, WHEN I WALK怎么样 When I Knew 歌词 When i was thriteen when i go to heart skpis a beat when i ,when 英语翻译When I ------- -------,I found I ------ ----- ------ ------ ---- -------