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"It is rather difficult to make friends with him,but his fri

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"It is rather difficult to make friends with him,but his friendship,________,i"
"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"
答案A
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.