Itisdifficulttomakefriendswithhim,butthefriendshipofhi...

问题详情：

 It is difficult to make friends with him, but the friendship of his,　　　 is more true than any other. 

A. once gained    B. when to gain   C. as gained   D. while gaining

【回答】

A

知识点：连词

题型：选择题