问题描述：
On the wall hung a picture,___colour is blue.A:whose B:of which C:which D:its 选什么!
On the wall hung a picture,___colour is blue.A:whose B:of which C:which D:its 选什么,
On the wall hung a picture,___colour is blue.A:whose B:of which C:which D:its 选什么,
问题解答：
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