问题
选择题
I ______ any help. Don't worry about me. [ ]
A. needn't
B. need
C. don't need
D. needs
答案
答案：C
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I ______ any help. Don't worry about me. [ ]
A. needn't
B. need
C. don't need
D. needs
答案：C
钢，此宽厚比为（）。