12.parents and their children often disagree about the amount of freedom and responsibility that yound people_____
A.would have B.are having C.are to have D.are about to have

17.-Come on in , peter I want to show you something.
-Oh, how nice of you, I___you ____to bring me a gift.
A. never,are going B.never though, were going
C.didn’t think,were D.hadn’t thought,were going

解释一下选择的原因~谢谢！

都是意译,翻译不好之处,望谅.

12;父母和他们的孩子经常为年轻人注定要承担的责任和自由支配的尺度意见不合.
A "would have"."would"表意愿,在此句中不符合句意.
B"are having "正在进行时,不符合句意.
此题重点区分CD.
C "be to do "表示有计划/命令/注定/应该.用于将来时态.
D "be about to do "也用于将来时,也表打算/计划做的事.但它后面的动作发生时间较近,多用于即将发生的动作.
表示的意思为:"年轻人注定/应该承担的责任和支配自由".
综上:选C

17:觉得你的选项单词拼写字母打少了.
A never后面应该还有个"thought".B "thought",你漏了个"t",就变成"though"了.

联系整段对话,后面部分应强调说话者"从未想过彼得会送礼物给他".
所以无可置疑应有"never".排除CD.
剩下就好办了."想"的动作发生在过去,前面用一般过去时,后面也相应用过去时.A用了现在时.可排除.
综上:选B