A. if B. even though C. unless D. as long as
单项选择题Listening to loud music at rock concerts caused hearing loss in some teenagers.()
A. is B. are C. has D. have
单项选择题He regretted()too much time on computer game.
A. to cost B. costing C. to spend D. spending
单项选择题It was the doctor's carelessness that()the serious accident.
A. resulted from B. resulted in C. brought up D. brought in