What are they doing? They .A. take photosB. are taking photoC. take a photoD. are taking p

问题补充：

What are they doing? They .

A. take photos

B. are taking photo

C. take a photo

D. are taking photos

答案：

A. take photos

B. are taking photo

C. take a photo

D. are taking photos

解析：上句是现在进行时的结构，回答语也要用这种结构，故本题AC，拍照的短语take photos或take a photo，故本题选D。