We should sleep ______eight hours a day, or it’s bad for our health.
A. at most  B.least C. at least

C

解析試題分析：句意：每天我們最少睡八個(gè)小時(shí)。否則對健康有害。at most至多； at least至少。結(jié)合句意，故選C
考點(diǎn)：考查副詞的用法

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