问题
选择题
Shirley had to buy ________ these CDs because she didn't know which one to take. [ ]
A. all
B. none
C. each
D. both
答案
答案：A
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Shirley had to buy ________ these CDs because she didn't know which one to take. [ ]
A. all
B. none
C. each
D. both
答案：A
，可知：（ ）
mg
g，且斜向上