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来源: 于 2013-01-10 10:51:54 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Yes, make sense... it seems "be careful" here is a phrase, not a verb, so no need to add "to" in front of. (BTW, I don't have any linguistic background, only based on hunch  :-) Thanks!