问题

_____ sleep every night is important for teenagers. _____, loss of sleep can make you feel tired, and even cause you to put on weight. [ ]
A: A good amount of; As a matter of fact
B: A good number of; In truth
C: A large amount of; As matter of fact
D: Plenty of; In a fact
B: A good number of; In truth
C: A large amount of; As matter of fact
D: Plenty of; In a fact
正确答案是: