题目内容（请给出正确答案）

[单选题]

________ research has been done into this difficult and complicated case, so we believe someday we can solve it.

A.Extensive

B.Extinctive

C.Executive

D.Exclusive

提问人：网友lzl731 发布时间：2022-01-07

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· 有4位网友选择 C，占比33.33%
· 有4位网友选择 B，占比33.33%
· 有3位网友选择 A，占比25%
· 有1位网友选择 D，占比8.33%

ABCD

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