英语提问 请给出答案并给出理由！

1)__my husband and i__down the road yesterday evening,we heard a woman scream.
A)since;had walked B)while;have walked C)as;were walking D)when;are walking
2)pierre left without saying a word to the boss because he cannot stand__ to wait.
A)be made B)to be made C)being made D)be making
3)fiona said that she felt quite embrassed that day because she was not accustomed to__like that.
A)be treating B)have been treated C)being treated d)be treated

请进，一道选择题，请给出你的答案，并给出理由 请给出答案并说明为什么？ 请问这个题目选择哪个答案,并给出理由 回答问题，并给出理由。 请给出答案 请给出详细答案 讲个真实的故事，并请大家给出答案 请列举一些PASCAL的练习题，并给出答案~~谢谢~~~ 谜语，请给出答案并解释，谜语在下面。 因式分解：a^4-3a^2+9。请给出答案并给出思路