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 isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete B: Little research has been conducted on the use of oil palm shell s coarse aggregate in the production of concrete. C: There isn't plenty of research on the use of oil palm shell as coarse aggregate in the production of concrete. D: There is only a little research on the use of oil palm shell as coarse aggregate in the production of concrete.

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2022-07-27

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 isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete B: Little research has been conducted on the use of oil palm shell s coarse aggregate in the production of concrete. C: There isn't plenty of research on the use of oil palm shell as coarse aggregate in the production of concrete. D: There is only a little research on the use of oil palm shell as coarse aggregate in the production of concrete.

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 isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete
B: Little research has been conducted on the use of oil palm shell s coarse aggregate in the production of concrete.
C: There isn't plenty of research on the use of oil palm shell as coarse aggregate in the production of concrete.
D: There is only a little research on the use of oil palm shell as coarse aggregate in the production of concrete.

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