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

They_________have arrived at lunchtime but their flight was delayed.

admin2021-03-29  33
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 本题句意：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“可能做过……吗?”表示对过去行为的怀疑，用于疑问句；must have done “一定做过某事”，表示对过去事情的肯定推测；should have done“本来应该做某事，而实际没做”，表虚拟。but their fight 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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