The tour pal lost his way in the mountain; made things worse was that it began to rain.A.

问题补充：

The tour pal lost his way in the mountain; made things worse was that it began to rain.

A. that

B. what

C. which

D. who

答案：

A. that

(答案→)B. what

C. which

D. who

解析：考查名词性从句。分析句子结构可知，本句包含两个并列分句。而第二个分句的主语为what引导的主语从句，what在主语从句中作主语。句意：这个驴友在山里迷路了。更糟糕的是开始下雨了。故B正确。