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    have been done是什么時態(tài)
    
            
            
    回答
    
            
    
                
                瑞文問答
                
    2024-08-18
            
    
            
    
                have been done是現(xiàn)在完成時的被動結(jié)構(gòu)。
    例句：
    Trivial formalities have been done away with. 
    繁瑣禮節(jié)都取消了。
    What could have been done better? 
    有哪些本可以做的更好？
            
    
            
            
    擴(kuò)展資料
    
            
    　　It could have been done carefully.
    　　它可能被小心地搜尋過。
    　　But no studies have been done in WOMEN.
    　　但沒有對女人進(jìn)行的研究。
    　　The same studies have been done in Asia.
    　　同樣的研究也在亞洲。