He is not easy-going, but his trust in his friends will last forever once _______.
A．to be gainedB．is gained
C．being gainedD．it is gained
D

試題分析：考查狀語從句的省略式：當主從句的主語一致的時候，可以省略從句的主語和be動詞，句意：他不是很隨和，但是他對朋友的信任一旦獲得就永遠不會消失。這里的it指代his trust in his friends，如果省略的話，應該是填gained，ABC都不對，所以就不用省略式，選D。
點評：狀語從句是對動詞或者句子的整個謂語動詞，對狀語從句的考查也是集中在連接詞的選擇上，要根據(jù)句子的意思來選擇契合句意的連接詞，同時要注意句子成分的分析。如果狀語從句要省略，必須符合條件，而且省略主語和be動詞。
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