The professor said that your discovery was ．
A. ofgreatvalue
B. greatvalue
C. greatlyvalued
D. ingreatvalue
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(答案→)A. ofgreatvalue
B. greatvalue
C. greatlyvalued
D. ingreatvalue
解析：句意：教授说你的发现是很有价值的。这里of+名词=形容词，value是名词。of great value= very valuable很有价值的，故选A。