1.Where--?Your hands are so dirty.Don’t touch anything in th

1.Where＿＿?Your hands are so dirty.Don't touch anything in the room.
A.have you gone B.did you go
C.have you been D.are you going
2.could you tell me＿＿?
A.when the palaces change into the Palace Museum
B.when were the palaces changed into the Palace Museum
C.when did the palaces change into the Palace Museum
D.when the palaces were change into the Palace Museum
另外说下原因..
D的答案错了..change应该有个d

1.C
have been 表示曾经去过某地 , 而 have gone 表示某人去了某地,当事人不在现场 , 其他两个选项不符合事态,根据句意应选C .
2.D