同学你好，该知识点来自沪江网校《英语零基础直达大学六级【双11专享特惠班】》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 has happened：We have just moved(1. 1);This has not
been easy(1. 3);I have⋯ put(11. 4-5);I have ever seen(1. 9)
What has been happening：I have been working(1. 1);I have been
trying(1. 2)
C have explained⋯have understood⋯Have you been listening⋯
has been working/has worked⋯has been earning/has earned⋯has she
earned⋯have not been listening
Key to SD Exercises
1 carefully 2 hard 3 hard 4 late
5 nearly 6 fast 7 high
Key to Multiple choice questions
1 b 2 c 3 c 4 a
5 b 6 d 7 c 8 b
9 a 10 c 11 b 12 d
Key to Sentence structure
To make matters worse, the room is rather small.

祝同学学习进步~