C. The popularity of social media has changed the way people stay in touch, overturned traditional social networking, and influenced business practices.
C. The popularity of social media has changed the way people stay in touch, overturned traditional social networking, and influenced business practices.
1: d) have did 2: b) had done 3: c) had cleaned-called 4. b) had told 5: a) told-had left 6: a) had finished 7: b) heard 8: c) had written 9: b) had gone
