It is rather difficult to make friends with him, but his friendship, , is more t

It is rather difficult to make friends with him, but his friendship, ________, is more true than others’．

A.once gained

B.when to gain

C.after gaining

D.while gaining

试题答案

A

解析：

本题考查状语从句的省略、引导词及非谓语动词的用法。句意为：“很难和他交朋友，但是，一旦获得他的友谊，将会比任何友谊更纯真。”此题应用过去分词作状语表示条件。once gained相当于once it is gained．gain和his friendship是被动关系，所以用过去分词。当条件状语从句的主语和主句的主语一致或主语为it时，可将从句的主语和系动词be一起省略。