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【单选题】
thEsE mAChinEs must ______ BEForE thEy ArE usED.
A.ChECk
B.BE ChECkED
C.ArE ChECkED
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1%
的考友选择了A选项
67%
的考友选择了B选项
6%
的考友选择了C选项
26%
的考友选择了D选项
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