There are many factors contributing to the explosion of being too fat in the United States and the world, ______ the fundamental changes in the composition of their diet are first among them.
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A. so B. for C. but D. however
参考答案:
I've got one more page to write; ________I've finished.[..
I've got one more page to write; ________I've finished.[ ]A. orB. otherwiseC. thenD. and