21. What is the main purpose of this advertisement?
(A) To introduce a new boarding school
(B) To promote a learning service
(C) To raise funds for a new language program
(D) To offer help to the underprivileged
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統計: A(0), B(6), C(0), D(0), E(0) #3557103
統計: A(0), B(6), C(0), D(0), E(0) #3557103