______we should be glad.

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问题 ______we should be glad.

选项 A、Were they to arrive tomorrow
B、They would arrive tomorrow
C、They were to arrive tomorrow
D、Were they arriving tomorrow

答案A

解析 该题是语法结构题,考查虚拟语气的用法。虚拟语气用在非真实条件状语从句中表示与将来事实相反时,该从句中的谓语动词可以用三种方式表示:动词过去式、were to do、should+动词原形。那么,选项B和选项D首先可以排除掉。选项C缺乏连接词,也可以排除掉。该句的虚拟语气使用的是were to do结构,从句中助动词were提前了,从而省略了连接词if。因此,根据题意和语法规则,选项A为最佳答案。
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