36．―What are they talking about?―They are talking about the photos on the Great wall．A．tak——青夏教育精英家教网—

摘要：36．―What are they talking about?―They are talking about the photos on the Great wall．A．taking B．were taken C．have been taken D．taken

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—What are they talking about?

—They are talking about the photos ________ on the Great wall．

A．taking B．were taken C．have been taken D．taken

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