搞不懂的一题

Several financial officers of the company spoke on condition that they not be named in the press reports.

1. that they not be named

2. that their names will not be used

3. that their names are not used

4. of not having their names

5. of not naming them

每次都选E ，可答案是A

为什么？

A 是固定用法，on condition 后面要用虚拟。

LZ查一下以前的帖子。