. He is rather difficult to makefriends with but his friendship ismore true than anyot

问题补充：

. He is rather difficult to makefriends with, but his friendship, , ismore true than

anyother.

A. once gained

B. when to gain

C. after is gained

D. while gaining

答案：

(答案→)A. once gained

B. when to gain

C. after is gained

D. while gaining

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