He is rather difficult to make friends with,but the friendship of his,once ________, is more true than any other.
A.gainedB.to gainC.having gainedD.gain在线课程A
解析:
once可引导时间状语从句表条件,意思是“一旦……”.此空填gained,其前省略了it is.在时间、条件、让步状语从句中,如果从句的主语和主句的主语相同,从句中谓语动词义含有be的某一种形式,可以省略从句中的主语或be动词.答案为A.例如:Once seen,it will never be forgotten.一旦见到,就永远不会忘掉.The research is so designed that once begun nothing can be done to change it.调查是预先计划的,一旦开始就无法改变.
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