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 is gained D. while gaining

. .A

解析:

once gained是狀語從句的省略, 相當于once it is gained。

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He is rather difficult to make friends with，but the friendship of his，once ________, is more true than any other．