12.It was long supposed ____ the main difference between animals and plants was that animals could move about.(3分) A. this B. that C. which D. because

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题目内容（西北大学大学英语（上））

12.It was long supposed ____ the main difference between animals and plants was that animals could move about.(3分)
A. this
B. that
C. which
D. because

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