He is rather difficult to make friends with, but the friendship of his, _____, is truer than that of anybody else’s.  
A．while gainedB．when to gainC．a(chǎn)fter gainingD．once gained
D

試題分析：句意:和他交朋友相當(dāng)困難,但是他的友誼,一旦獲得了,就比其他任何人的都真實(shí).當(dāng)主從句的主語一致時(shí)，可以省略從句的主語和be動(dòng)詞，once gained=once" his friendship is "gained，選D。
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