OG详解-OG7 文法 Q25

Choice D is the best answer. “Specifically” logically signals that the information in this sentence—that the Local Bubble’s expansion trapped clouds of gas and dust that formed new stars—provides specific, precise details elaborating on the more general information in the previous sentence about the relationship between the Local Bubble’s expansion and the formation of new stars.
Choice A is incorrect because “hence” illogically signals that the information in this sentence is a result of the information in the previous sentence about the relationship between the Local Bubble’s expansion and the formation of new stars. Instead, this sentence provides specific, precise details elaborating on that information. Choice B is incorrect because “however” illogically signals that the information in this sentence contrasts with the information in the previous sentence about the relationship between the Local Bubble’s expansion and the formation of new stars. Instead, this sentence provides specific, precise details elaborating on that information. Choice C is incorrect because “admittedly” illogically signals that the information in this sentence provides an exception or caveat to the previous information about the relationship between the Local Bubble’s expansion and the formation of new stars. Instead, this sentence provides specific, precise details elaborating on that information.