55 If you collect seven _____ from the grocery store, you can get a free mug.
(A) checks
(B) boosters
(C) brands
(D) coupons
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統計: A(6), B(3), C(3), D(95), E(0) #1544200
統計: A(6), B(3), C(3), D(95), E(0) #1544200