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我当时应该放聪明一点才是。 A: This milk has gone bad. You can't leave milk sitting out; you've got to put it in the refrigerator. B: You're right. I should have known better. 甲：这牛奶已坏了。你不能把牛奶放在外面，必须把它放在冰箱内才行。 乙：您说得是。我当时若知道这么做就好了。
