They________have arrived at lunchtime but their flight was delayed.(2011·全國 )
A．willB．canC．mustD．should
D
D　[考查虛擬語氣的用法。句意為：他們本該午飯時到達，但他們的航班推遲了。should have done本來應該做某事，而實際沒做。but their flight was delayed這樣的結(jié)果，說明他們本來該到達卻沒有到達，因此選D。]
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