问题描述：
| _____ 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 |
考点提示：形容词,介词和介词短语
最佳答案： | A |
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