The traveler lost his way in the woods and made things worse was that it was getting dark

问题补充：

The traveler lost his way in the woods, and made things worse was that it was getting dark.

A. that

B. what

C. which

D. as

答案：

A. that

(答案→)B. what

C. which

D. as

解析：主语从句made things worse 缺少主语，应用what引导。that在名词性从句中连接词的作用，不充当任何成份。故选B。