I couldn’t help but （） that it was a mistake to let him go alone.A) think B) thought C) to think D) thinking为什么答案选A?不是说but前面有do不加to,前面没do要加to吗?

i couldn't help but I couldn't help Cry,not I want to,but couldn't help it. I couldn't help but smile back at him.翻译 I couldn't help but cry.为什么后面不用不定式to cry呢?I couldn't help but cry such being the case,I couldn't help but support him.being为什么不用be Cry,not I want to,but couldn't help it如题 I Couldn't Help It 歌词 英语翻译：I listened intently, but I couldn’t help but wonder where he was going with this. But I could ,couldn't?翻译 I tried hard ,but I couldn't find the ( )to the problemA solution B help C reply D demand I just couldn't help help怎么解释啊！ Such was the case, and I couldn't help but support him.Such being the case, I couldn't help but support him.帮忙分析一下这两句句子,谢谢! When I secretly sad,reminds of you,but I couldn't help crying.Ever thought I won't cry,but at tWhen I secretly sad,reminds of you,but I couldn't help crying.Ever thought I won't cry,but at this moment,I just found.I still cannot forget you I couldn`t help用适当形式填空 .I couldn’t help praising the master’s ---------- 英语翻译 Excuse me,i couldn't help overhearing your conversation 填介词 I couldn't finish it() your help.