Look! Some students _____ games under the big tree.     [ ]

A. play    

B. are play    

C. are playing  

D. played

检验检测机构对检测合格的施工起重机械和整体提升脚手架、模板等自升式架设设施，应当出具安全合格证明文件，但不对检测结果负责。