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
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(答案→)A. once gained
B. when to gain
C. after gaining
D. while gaining
解析：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.