They        have arrived at lunchtime but their flight was delayed.
A．willB．canC．mustD．should
D
句意為“他們本該午飯時(shí)到達(dá)，但他們的航班推遲了。”will have done將來可以完成；can have done可能做過……嗎？表示對過去行為的懷疑，用于疑問句；must have done一定做過某事，表示對過去事情的肯定推測；should have done本來應(yīng)該做某事，而實(shí)際沒做。but their flight was delayed這樣的結(jié)果，說明他們本來該到達(dá)卻沒有到達(dá)，因此選D。
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