问题
选择题
It's so cold and you've walked a long way. You _______ be tired. Have a rest. please. [ ]
A. can't
B. might
C. must
D. can
答案
答案：C
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It's so cold and you've walked a long way. You _______ be tired. Have a rest. please. [ ]
A. can't
B. might
C. must
D. can
答案：C
下列级数中绝对收敛的是（）。
