The advertisement for the security guard position says that applicants must b...

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问题 The advertisement for the security guard position says that applicants must be able to remain __________ for six hours straight.

选项 A. alert
B. observable
C. discovered
D. obvious

答案A

解析选择恰当的词汇填入动词remain之后的补语的位置。remain后面主要接表示状态的形容词，作为招募警卫员的广告，填入空格为“警戒的”形容词最为恰当。

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