__we are doing has never been done beforeA that B what

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__we are doing has never been done beforeA that B what

__we are doing has never been done beforeA that B what
__we are doing has never been done before
A that B what

__we are doing has never been done beforeA that B what
___we are doing has never been done before.
B,What 是正确答案
[What] we are doing has never been done before.✓这样的读法是正确的
[That] we are doing has never been done before.✗如果用'that’那么就不对了,如果在这个句子里加'subject‘（That subject we are doing has never been done before）,那么就对了.但是这个句子里无类似'subject’的词,因此我们不选A
为了完整了解,特地翻译成中文.以下是正确翻译：
我们正在做的事是以前从未做过的.

选 B

What 引导主语从句，指代我们正在做的事。

我们正在做的事以前从未做过。

What 我们正做的事情以前从来没做过。主语从句用what

B what what 引导主语从句。

B what
that没有意思，不能充当成分，所以选B

选 B

What 引导主语从句，指代我们正在做的事

选B，很明显，是what 引导的主语从句，what we are doing这个句子作为整个句子的主语部分，表示我们正在做的事情是以前从来没有做过的。

选B
这里what指代的内容既是从句we are doing的宾语
也是主句的主语
that没有这一功能
我们正在做的事情之前从来没有被完成过

__we are doing has never been done beforeA that B what That we are doing has never been done before.改错 the fourth lesson __we are to learn is much more difficult than the lesson __we learned last week定语从句填空 what are you doing? What are they doing? what are they doing? What are you doing? what are you doing What are you doing? What are u doing? WHAT ARE YOU DOING? you are doing How are you doing? what are you doing? How are you doing? How are you doing? what are we doing where are you doing?