They _____ have arrived at lunch time bu...

They _____ have arrived at lunch time but the flight was delayed.

A．should

B．can

C．must

D．will

A 【解析】考察情态动词 should have done本应当干某事 can have done可能做了某事 must have done一定做了某事 will have done 将要做好句意为，他们本应该在午饭的时候到达，但是航班被推迟了。

考点分析：

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