As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

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问题 As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

选项 A、porch
B、edge
C、threshold
D、fringe

答案C

解析 固定搭配题。on the threshold of意为“开端,起点”,符合句意。porch意为“门廊”;on the edge意为“在…的边缘,处于一触即发、不稳定的状态”;fringe意为“边缘,次要,外围”。
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