27. What is the main reason why Billy wrote this letter?
(A) To thank his grandparents for the gifts they sent
(B) To tell his grandparents about the weather there
(C) To tell his grandparents what Cathy does with the doll
(D) To thank his grandparents for visiting them at Christmas

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統計： A(280), B(15), C(8), D(14), E(0) #2205348