问题描述：
wood is one of ( )in our life A、useful materials B、more useful material C、the most useful
wood is one of ( )in our life A、useful materials
B、more useful materials
C、the most useful materials
D、the most useful material
wood is one of ( )in our life A、useful materials
B、more useful materials
C、the most useful materials
D、the most useful material
问题解答：
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