China has changed a lot in the past years．According to the pictures, please write an e-mail to your foreign teacher Peter about the changes to China in the name of Mary．Tell him about your thoughts ．

Dear Peter,

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Yours sincerely,

Mary

China ________ the WTO in 2001.

A. join                 B. joins            C. joined               D. joining

China _______ the WTO and became a new member of it six years ago.

　　A.joined　　B.join　　C.will join　　D.has joined