when to leave I could only stay at home nothing. A. Knowing not; doneB. Not having kno

问题补充：

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

答案：

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