Question

They lost their way in the forest and this

made matters worse was that night began to fall.
this处能用what吗?
如果用what怎么改?

Answer 1

可以改啊。
They lost their way in the forest and what made matters worse was that night began to fall。
直接替代就行了，what作引导后面的主语从句的引导词。

Answer 2

本来就该用WHAT,用WHAT指代night began to fall
而且还有一个固定用法就是 WHAT'S WORSE意为更糟的是……

Answer 3

地道的美国说法用what 直接取代就可以

Answer 4

They lost their way in the forest and what made matters worse was that night night began to fall.