【題目】______ do teenagers need to sleep ?

At least eight hours a night

A. How longB. How manyC. How often

【答案】A

【解析】

句意:——青少年需要睡多久?——至少每晚8小時。

how long多久,用于提問時間段;how many 多少,用來提問可數(shù)名詞的數(shù)量;how often 多少時間一次,用于提問頻度副詞,根據(jù)回答At least eight hours a night,用How long提問,根據(jù)題意, 故選A

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