Question

---Are you sure you have to do it? It’s been very late.-----I don’t know ________I can do...

---Are you sure you have to do it? It’s been very late.-----I don’t know ________I can do it if not now.A .where B. why C. when

Answer 1

C

试题分析：—你确信你必须做这件事吗？现在已经太晚了。—我不知道如果现在不做什么时候我能做。根据句意是什么时候，所以选when，故选C。