As one of the youngest doctors in the hospital, Ms. Lin is on the______of a bright future.

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问题 As one of the youngest doctors in the hospital, Ms. Lin is on the______of a bright future.

选项 A、verge
B、edge
C、course
D、threshold

答案D

解析 固定搭配题。on the threshold of表示“即将,在……开始之时”,符合句意,故为答案。course不能与on连用构成短语,正确表述是in the course of“在……期间”;verge和edge意思相似,均表示“边缘”,构成题中的短语时,表示“在……边缘,濒于”,多用于表示负面含义。
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