单选题 They lost their way in the forest, and ______ made matters worse Was night began to fall.
【正确答案】 C
【答案解析】本题测试连词的用法。what在这里既引导主语从句又在句中充当主语。本句大意为：他们在森林中迷了路，更糟糕的是夜幕开始降临了。