GWD4-30

Q30:

Under high pressure and intense heat, graphite, the most stable form of pure carbon, changes into the substance commonly referred to as diamond and remaining this way whether or not the heat and pressure are removed.

1. remaining this way whether or not
2. remaining like that even as
3. remaining as such whether or not
4. remains in this way although
5. remains thus even when

答案是D，可是E怎么错了呢？

我认为thus这样用有点怪。Longman上是如下解释thus的。会有可能是第二种用法么？

thus
                
            formal