同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【双11专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
答案可以在资料包内看到
https://class.hujiang.com/sharef/722584

Key to KS Exercises
C
1 shall have been working
2 have finished
D
1 had to go
2 should/ought to buy
3 should have/ought to have telephoned
Key to SD Exercises
1 shop assistant
2 hung
3 hanged
Key to Multiple choice questions
1 b 2 d 3 b 4 b
5 c 6 c 7 d 8 b
9 b 10 c 11 b 12 a
Key to Sentence structure
If the Houses of Parliament had not been burned down, the great
clock would never have beed erected.

祝同学学习进步~