题目内容（请给出正确答案）

[单选题]

（)they are doing has never been done before.A. ThatB. WhatC. WhyD. Whether

A. That

B. What

C. Why

D. Whether

提问人：网友zhangwei2018 发布时间：2022-01-06

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· 有5位网友选择 D，占比18.52%
· 有4位网友选择 D，占比14.81%
· 有3位网友选择 B，占比11.11%
· 有3位网友选择 A，占比11.11%
· 有2位网友选择 A，占比7.41%
· 有2位网友选择 C，占比7.41%
· 有2位网友选择 D，占比7.41%
· 有2位网友选择 C，占比7.41%
· 有1位网友选择 B，占比3.7%
· 有1位网友选择 A，占比3.7%
· 有1位网友选择 C，占比3.7%
· 有1位网友选择 B，占比3.7%

ABCD

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