2、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

时间:2024-04-12 10:24:37

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