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

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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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