Question

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

1. A.
   once gained
2. B.
   when to gain
3. C.
   after gaining
4. D.
   while gaining

Answer 1

A
解析：
本題考查狀語(yǔ)從句的省略、引導(dǎo)詞及非謂語(yǔ)動(dòng)詞的用法。句意為：“很難和他交朋友，但是，一旦獲得他的友誼，將會(huì)比任何友誼更純真�！贝祟}應(yīng)用過(guò)去分詞作狀語(yǔ)表示條件。once gained相當(dāng)于once it is gained．gain和his friendship是被動(dòng)關(guān)系，所以用過(guò)去分詞。當(dāng)條件狀語(yǔ)從句的主語(yǔ)和主句的主語(yǔ)一致或主語(yǔ)為it時(shí)，可將從句的主語(yǔ)和系動(dòng)詞be一起省略。