单选题__________sleepeverynightisimportan

单选题 __________ sleep every night is important for teenagers. _________, loss of sleep can make you feel tired, and even cause you to put on weightA.A good amount of; As a matter of factB.A good number of; In truthC.A large amount of; As matter of factD.Plenty of; In a fact

A解析考查短语辨析。A good amount of和.A large amount of后修饰不可数名词，A good number of后修饰可数名词复数，Plenty of后修饰可数或不可数名词都可以，短语：事实上As a matter of fact或In fact，根据语境所以选A。

就是这个解释