Look! The students are showing how to operatethe mechine in the workshop now. A B C DA are

发布时间：2020-08-17 13:32:46

Look! The students are showing how to operatethe mechine in the workshop now.
A               B      C                   DA  are showing--- are being shown 

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(答案→)A  are showing--- are being shown 
解析：根据句意，这里要用现在进行时的被动形式。
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