题目内容
13.By the time I joined Greener Group,theyhad volunteered to clean up libraries(义务打扫图书室) for 2 years.(volunteer)分析 到我加入环保组织的时候,他们已经义务打扫图书室两年了.
解答 答案:had volunteered to clean up libraries.
根据提示汉语结合语境推测句意是"到我加入环保组织的时候,他们已经义务打扫图书室两年了.","义务打扫图书室"的英文表达是volunteer to clean up libraries,根据时间状语判断用过去完成时,构成是:had+动词的过去分词,所以答案是:had volunteered to clean up libraries
点评 做这类题型,首先根据所给汉语明确句子所要考查的单词或短语的拼写,再结合相关语法知识对单词或短语做出形式上的变化.
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