不过，我必须承认，他这样瞒着我，过去几周他肯定偷着乐呢。
Though I must say, I think he's been having even more fun keeping the secret from me the past few weeks.
我想凯文是个很好的人，不过你必须承认他不很负责任。
I think Kevin is a very nice person, but you have to admit he isn't very responsible.
我必须承认，一开始我认为这不过是朋友们的玩笑。
I must admit that at first I thought it was a wind-up by friends.
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