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The students ______ the classroom, so it...

The students ______ the classroom, so it’s tidy and clean now.

A. Clean    B. have cleaned    C. will clean    D. cleans

 

B 【解析】句意:学生们已经打扫了教室,因此现在是整洁和干净的。根据语境可知用现在完成时,其结构是have/has done的形式。主语是复数,这里用助动词have。根据题意,故选B。 点睛:现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在。它的构成是:主语+have/has +动词的过去分词。  
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