They _____ have arrived at lunch time but the flight was delayed.
A．shouldB．canC．mustD．will
A
考察情態(tài)動(dòng)詞 should have done本應(yīng)當(dāng)干某事 can have done可能做了某事 must have done一定做了某事 will have done 將要做好
句意為，他們本應(yīng)該在午飯的時(shí)候到達(dá)，但是航班被推遲了。
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