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若要打开A盘上user了目录下名为abc.txt的文本文件进行读、写操作,下面符合此要求的函数调用是

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fopen("A:/user/aaa.txt","r")  fopen("A://user//aaa.txt","r+")  fopen("A:/user/aaa.txt","rb")  fopen("A://user//aaa.txt","w")  
fopen("A:/user/abc.txt","r")  fopen("A://user//abc.txt","r+")  fopen("A:/user/abc.txt","rb")  fopen("A://user//abc.txt","w")  
fopen(“A:/user/abtxt”,“r”)  fopen(“A://user//abtxt”,“r+”)  fopen(“A:/user/abtxt”,“rb”)  fopen(“A:/user//abtxt”,“w”)  
fopen("A:\user\abtxt","r")  fopen("A:\\user\\abtxt","r+")  fopen("A:\user\abtxt","rb")  fopen("A:\\user\\abtxt","w")  
fopen("A:/user/abtxt",","r")  fopen("A://user//abtxt","r+")  fopen("A:/user/abtxt","rb")  fopen("A://user//abtxt","w")  
fopen("A:/user/aatxt","r")  fopen("A://user//aatxt","r=")  fopen("A:/user/aatxt","rb")  fopen("A://user//aatxt","w")  
fopen(“A:/user/abc.txt”,“r”)  fopen(“A://user//abc.txt”,“r+”)  fopen(“A:/user/abc.txt”,“rb”)  fopen(“A:/user//abc.txt”,“w”)  
fopen("A:/user/aaa.txt","r")  fopen("A://user//aaa.txt","r=")  fopen("A:/user/aaa.txt","rb")  fopen("A://user//aaa.txt","w")  

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