Because of the tightened security measures, all travelers are advised to arrive at the airport______two hours before their depar

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问题 Because of the tightened security measures, all travelers are advised to arrive at the airport______two hours before their departure time.

选项 A、few
B、a little
C、at least
D、less

答案C

解析词汇：副词1．数字前经常出现的副词at least(最少)符合题意，因此(C)为正确选项。

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