They______have arrived at lunch time but their flight was delayed.

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问题 They______have arrived at lunch time but their flight was delayed.

选项 A、will
B、can
C、must
D、should

答案D

解析 本题解题的关键在于把握情态动词在句中所表达的情感。句子的意思为,他们应该在午饭的时间到达,但是航班却晚点了。根据句意应选D。
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