单项选择题

First published in 1927, the charts remain an ______ source for researchers.

A．identical
B．indispensable
C．intelligent
D．inevitable
<上一题 目录 下一题>
热门 试题

单项选择题
His business was very successful, but it was at the ______ of his family life.
A．consumption
B．credit
C．exhaustion
D．expense
单项选择题
The board of the company has decided to ______ its operations to include all aspects of the clothing business.
A．multiply
B．lengthen
C．expand
D．stretch
相关试题