He is rather difficult to make friends with, but the friendship of his, _____, is truer than that of anybody else’s.??

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

. He is rather difficult to make friends with, but the friendship of his, _________,is truer than that of anybody else’s.

A. once  gained         B. while  gaining         C. if  gains                  D. after gained

He is rather difficult to make friends with, but the friendship of his, ________, is truer than that of anybody else’s．

1. A.
   while gaining
2. B.
   once gained
3. C.
   if gaining
4. D.
   after gained

He is rather difficult to make friends with, but the friendship of his, _____, is truer than any other.

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

. He is rather difficult to make friends with, but the friendship of his, _________,is truer than that of anybody else’s.

A. once  gained       B. while  gaining       C. if  gains             D. after gained