_____common usage among economists, the term "natural rate" is misleading.

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问题 _____common usage among economists, the term "natural rate" is misleading.

选项 A、It has gained
B、That it has gained
C、Has it gained
D、Although it has gained

答案D

解析 Although it has gained is a subordinator + subject + verb structure, which forms the beginning of an adverb clause.

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托福（TOEFL）

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