have been 是现在完成时 have done的运用式 （be动词的过去分词形式为been）
后面之所以要用 doing 是因为前面一词been 是be动词的变化式 这个句子强调的是现在还在做 所以be动词后面要跟doing
句子意思是 我们（从刚才到现在）一直在做这件事.
we have been doing it
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