when to leave, I could only stay at home, nothing.
A. Knowing not; done
B. Not having known; doing
C. Having not known; done
D. Not knowing; doing
网友回答
A. Knowing not; done
B. Not having known; doing
C. Having not known; done
(答案→)D. Not knowing; doing
解析：考查非谓语动词的用法：第一空是现在分词的否定做状语，我只呆在家里是因为不知道什么时候走，现在分词的否定not在现在分词前面，第二空填现在分词做伴随状语，句意是：不知道什么时候走，我只好呆在家里什么都不做。选D。
考点; 考查非谓语动词