13 Puppies need something to _____ on when they begin teething so that their teeth can develop healthily.
(A) pebble
(B) nibble
(C) bubble
(D) gobble
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統計: A(239), B(553), C(247), D(307), E(0) #2782324
統計: A(239), B(553), C(247), D(307), E(0) #2782324