Of all the blue holes in the world， Sansha Yongle Blue Hole in the South China Sea is now ____． It is 300.89 meters deep．（ ）
A．deeperB．very deep
C．as deep asD．the deepest
Of all the blue holes in the world， Sansha Yongle Blue Hole in the South China Sea is now ____． It is 300.89 meters deep．（ ）
A．deeperB．very deep
C．as deep asD．the deepest
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