They        have arrived at lunchtime, but their flight was delayed.
A．willB．canC．mustD．should
D
考查虛擬語氣。根據(jù)后一句their flight was delayed.可知這是對過去情況進行假設(shè)。Must have done一定做了某事（表示推測）；should have done本應(yīng)該做某事實際上卻沒有做。句意：他們本應(yīng)該在午飯到，但是他們的航班延誤了！
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