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~
Key to KS Exercises
A
What happened：died (1. 1); died (1. 5); lasted (1. 6); proved
to be (1. 7); covered (1. 8); removed (1. 8); sent (1. 9); found
(1. 9); did not show (1. 9); was normally placed (1. 10); died (1.
11); feared (1. 11); cut (1. 12); survived (l. 12)
What has happened：has just had (11. 1 -2); have not yet decided
(1. 10)
What has been happening：have been trying (1. 4)
C
1 for 3 since 5 for 7 since 9 since
2 ago 4 since 6 ago ⋯ since 8 ago 10 for
Key to SD Exercises
1 complexion
2 leather
3 skin
4 candle
5 B. C.
Key to Multiple choice questions
1 a 2 c 3 a 4 b
5 c 6 d 7 d 8 d
9 a 10 a 11 b 12 a

祝同学学习进步~