题目内容（请给出正确答案）

[单选题]

Which of the following is not tool of genetic engineering？

A.Vectors

B.Enzymes

C.Foreign DNA

D.GMO

提问人：网友defghin 发布时间：2022-01-07

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· 有4位网友选择 A，占比50%
· 有3位网友选择 C，占比37.5%
· 有1位网友选择 B，占比12.5%

ABCD

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