我想问 I don't know what 's the matter with him

我想问 I don't know what 's the matter with him I don't know. “i don't know you know i don't know sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now 翻译 i don't know So know,I don't I don't know her i don't know anything I don't know -----it next .A wha t to do B how to do C how can I do D what can I do答案为什么是B What is his mother's name A.I am Sue.B.Her name is Sue.C .I don't know我想问一下,这个选择C对吗? I know enough to know that I don't know I don't know if his idea _____（有效） 这个空填什么我想问的是这个空是什么时态 是一般现在时还是一般将来时