2. 外语
  3. They________have arrived at lunchtime but their flight was delayed.

They________have arrived at lunchtime but their flight was delayed.

admin2021-09-12  65
问题 They________have arrived at lunchtime but their flight was delayed.
选项 A、will
B、can
C、must
D、should
答案D
解析 句意：他们本该在午饭时间到达，但他们的航班延误了。will have done表示将来可以完成；can have done意为“可能做过……吗?”表示对过去行为的怀疑，用于疑问句；must have clone意为“一定做过某事”，表示对过去事情的肯定推测；should have done意为“本来应该做某事，而实际没做”，表虚拟。but their flight was delayed这样的结果，说明他们本来该到达却没有到达，故选D。
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