2. 职称英语
  3. Before the flight takes off, all passengers (ask) ______to fasten their seat bel

Before the flight takes off, all passengers (ask) ______to fasten their seat bel

游客2024-06-23  64
问题 Before the flight takes off, all passengers (ask) ______to fasten their seat belts.
选项
答案 are asked
解析 本题考查的是谓语动词的时态。时间状语从句用before引导，而且从句谓语动词用了一般现在时，故主语不能用过去时态，而应用现在时态。在主句中用一般现在时，通常指现阶段已经计划好或安排好的情况。故可先确定ask用一般现在时。再看主语passengers与谓语ask之间的逻辑关系，应为被动关系。因此填are asked。
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