in the air, this kind of steel become harder and harder.A. CoolingB. Having cooledC. Being

发布时间:2020-08-16 10:27:12

    in the air, this kind of steel bee harder and harder.
A. Cooling
B. Having cooled
C. Being cooled
D. Cooled

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A. Cooling
B. Having cooled
C. Being cooled
(答案→)D. Cooled
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