单选题
The scientists became very excited as they felt they were _____ of a discovery.无
A、
on the crest
B、
on the surface
C、
on the borderline
D、
on the brink
【正确答案】
D
【答案解析】
句意：科学家们非常兴奋， 因为他们感到一个大发现近在眼前。 on the brink of为固定搭配， 意为“在……的边缘”。 其他选项不符合题意。
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