Question

 (2010年煙臺檢測)He is rather difficult to make friends with，but his friendship，________，is more true than any other’s.

A．once gained                         B．when to gain

C．a(chǎn)fter gaining                        D．while gaining

Answer 1

解析：選A。考查省略。這里“once gained”是once the friendship is gained的省略，由此可知，the friendship與gain之間存在“被動關(guān)系”，所以這里選A。