They were caught in the forest, and ______ made matter worse was that it kept raining cats and dogs.
A、
it
B、
which
C、
what
D、
that
【正确答案】
C
【答案解析】
空格处需填入一个关系代词既引导主语从句，又在从句中作主语，故选what。it不是关系代词，which和that不能在主语从句充当主语。
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