21. What is the main purpose of this advertisement?
(A) To announce a special sale event
(B) To explain the benefits of staying organized at home
(C) To introduce a practical piece of furniture
(D) To ask for donations of secondhand furniture
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統計: A(0), B(0), C(5), D(0), E(0) #3557063
統計: A(0), B(0), C(5), D(0), E(0) #3557063