语法与词汇
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： 科学家非常兴奋， 因为他们正处于一项发现的边缘。 on the brink of即将。 on the crest of在……的顶峰。 on the surface of在……的表面。 on the borderline在……的边界。 因此选D。
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