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请在下面几个相同含义的句子中,选择出你认为是formal expression的句子:
A、There are some studies that have concluded that bamboo could be used by builders more widely than it is now as a construction material.
B、Some studies have concluded that bamboo could be more widely used than it is now as a construction material.
C、Bamboo could be used by builders more widely than it is now as a construction material is concluded by some studies.
D、According to a number of recent studies, it is feasible to increase the use of bamboo in the construction industry