问题
选择题
I have _______ all of my newspapers, but I can't find the article.[ ]
A. looked at
B. looked after
C. looked for
D. looked through
答案
答案：D
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I have _______ all of my newspapers, but I can't find the article.[ ]
A. looked at
B. looked after
C. looked for
D. looked through
答案：D
，则力
，
，
三轴之矩为（）。
