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【单选题】
从甲组的 40 件产品与乙组的 20 件产品中抽出一件进行质量检测,共有 ( ) 种抽取方法.
A.
40
B.
20
C.
60
D.
30
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【单选题】In a state in the USA, you _______ make ugly faces at a dog, or you can be arrested for doing so.
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A.
have to
B.
must
C.
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查看完整题目与答案
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