27.It is rather difficult to make friends with him, but once_____,his friendship is more valuable than any other's.
答案解析
解析:
分析句子结构可知,空处应用非谓语动词。gain 和 his friendship 之间是逻辑上的动宾关系,且句中没有明显的表示时间先后顺序的词,所以应用过去分词,表示被动。故选 A。
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