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【题目】Most teenagers to sleep eight hours every night.
A.need
B.should
C.needn't

【答案】A
【解析】句意:大多数青少年每天晚上需要八个小时的睡眠。need需要;should应该;needn't不需要,是need not的缩写。根据句意可知,青少年需要每晚八个小时的睡眠,故应选A。

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