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问:(西安马建奎)在新编《教与学·高中英语》第44页有以下两道选择题: (4)Let A B C be a triangle____sides are of unequal length. A. that B. which C.whose D. of which (5)The building____windows are bright at night is our school library. A. that B. which C. whose D. of which 这两道题下面的释疑是