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 选择恰当的词汇填人动词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,填人空格为“警戒的”形容词最为恰当。
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