Do you know what the population of Dalian is is为什么放在最后.
为什么不是Do you know what is the population of Dalian?
The small children dont't know
A.what is their stockings in
B.what is in their stockings
C.where is their stockings in
D.what in their stokings
照理说应该是：where their stockings in is
上面4个答案都不是吧，但是，到底什么是正确答案。