we were happy that time and I will never forget it(保持原义)we_____ _____be happy that time and I will never forget it

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we were happy that time and I will never forget it(保持原义)
we_____ _____be happy that time and I will never forget it

used to 过去.

used to应该是过去那段时间开心的意思

We were so happy that time that I will never forget it.