问题
选择题
He is difficult to make friends with, but the friendship of his, ____, is more true than any other's. [ ]
A. once gained
B. when to gain
C. after gained
D. while gaining
答案
答案：A
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He is difficult to make friends with, but the friendship of his, ____, is more true than any other's. [ ]
A. once gained
B. when to gain
C. after gained
D. while gaining
答案：A