OG详解-OG10 文法 Q14

Choice D is the best answer. The sentence uses “both” to emphasize a thematic similarity between Tan’s two books, noting that both Tales from Outer Suburbiaand Tales from the Inner City describe surreal events occurring in otherwise ordinary places. 
Choice A is incorrect. The sentence emphasizes a difference (one contains fewer stories than the other), not a similarity, between the two books. Choice B is incorrect. The sentence indicates that Tan’s books were published ten years apart; it doesn’t emphasize a similarity between the two books. Choice C is incorrect. The sentence uses “unlike” to emphasize a difference between Tales from Outer Suburbia and Tales from the Inner City; it doesn’t emphasize a similarity between the two books.