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B
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A．They will build some huge walls to walk on.B．They will build gates in the sea to keep water out.C．They will build some roads in the sea.D．They will build some more buildings in the sea.
A．They will build some huge walls to walk on.
B．They will build gates in the sea to keep water out.
C．They will build some roads in the sea.
D．They will build some more buildings in the sea.
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