15. Cathy: What are these flowers for? Oscar: We're going to use them to ___the Christmas tree. Would you please help us put them in the tree?
(A) celebrate
(B) create
(C) decorate
(D) produce
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統計: A(5), B(4), C(24), D(6), E(0) #2347095
統計: A(5), B(4), C(24), D(6), E(0) #2347095