请选择DCBA:b8b(}:m9P4f'vIf these trousers are too big, buy a smaller____.5P/X6s;z;B2{;]2W
A. set5P/X6s;z;B2{;]2W
B. one5P/X6s;z;B2{;]2W
C. piece5P/X6s;z;B2{;]2W
D. pair5P/X6s;z;B2{;]2W