问题
选择题
They don't come to the book club any more, for ________ reasons or other.
A. some
B. all
C. either
D. both
答案
答案：A
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They don't come to the book club any more, for ________ reasons or other.
A. some
B. all
C. either
D. both
答案：A
，斜面的倾角为53°（
，g=10m/s2）