The students were taking graduation photos on the sports ground school uniforms.A. all o

问题补充：

The students were taking graduation photos on the sports ground, school uniforms.

A. all of them wore

B. all wearing

C. all of whom wearing

D. all were wearing

答案：

A. all of them wore

(答案→)B. all wearing

C. all of whom wearing

D. all were wearing

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