题目内容：

完成句子.
I'm so sorry______at such an awkward time,but I really had something urgent to tell you.(call)
我真的很抱歉在这么不合适的时间给你打电话,但我真的有急事告诉你.
have called you,请问为什么要用have done,不能只用do吗
How can you ask again?I think_____at all when I presented the answer to you.(listen)
你怎能再问一遍?我认为当时我在讲解答案时你根本没听.
答案是you were not listening,请问为什么不用情态动词表推测?