问题
选择题
He is rather difficult to make friends with, but his friendship, _____, is more true than any other.
A．once gained
B．when to gain
C．after gaining
D．while gaining
答案
答案：A
短语辨析. A. 一旦获得了;B. 什么时候得到C.得到后D. 而获得.句意:和他交朋友相当困难,但是他的友谊,一旦获得了,就比其他任何人的都真实.选A.