河南成教 / 大学英语4
正确率：100%
9[单选题]
First published in 1927, the chart remains an _ _ _ _ _ _ source for researchers.
A.identical
B.inevitable
C.intelligent
D.indispensable
First published in 1927, the chart remains an _ _ _ _ _ _ source for researchers.
参考答案：
佳题速递：