I think it advisable that an armed guard_____in readiness.

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问题 I think it advisable that an armed guard_____in readiness.

选项 A、is standing
B、will stand
C、stands
D、stand

答案D

解析 虚拟语气。在有essential,appropriate,imperative,important,impossible,necessary,obligatory,proper等表示“重要性”和“紧迫性”的形容词以及表示“建、决、要、命”类的形容词之后的that-分句中,要使用be一型虚拟句式,(should)+动词原形。
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