单项选择题

Our starboard derrick boom of hatch No.4 is badly crack……

Our starboard derrick boom of hatch No.4 is badly cracked（）that it has become entirely useless.

A.at its goose neck to such a extent
B.at it's goose neck to such an extent
C.at it's goose neck for such a extent
D.at its goose neck to such an extent

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