28. Not only ________among the most popular household pets, but they are also among the most intelligent.
(A) dogs are
(B) are dogs
(C) when dogs
(D) they are dogs
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統計: A(45), B(43), C(1), D(3), E(0) #1850370
統計: A(45), B(43), C(1), D(3), E(0) #1850370