The room became hotter and hotter. I had to take off my sweater.
A.Unless the room became hotter and hotter, I had to take off my sweater.
B.Although the room became hotter and hotter, I had to take off my sweater.
C.The room became hotter and hotter, but I had to take off my sweater.
D.The room became hotter and hotter, so I had to take off my sweater.

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