针对下面句子关于style的改写 哪个是正确的? There isn’t very much research on the use of oil

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针对下面句子关于style的改写,哪个是正确的? There isn’t very much research on the use of oil palm shell as coarse aggregate in the production of concrete.

A.Little research has been conducted on the use of oil palm shell s coarse aggregate in the production of concrete.

B.The use of oil palm shell as coarse aggregate for concrete is under-researched.

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.##

针对下面句子关于style的改写 哪个是正确的? There isn’t very much research on the use of oil

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