The emergency required that all the tasks _____ at least two days ahead of time．
A．to complete   B．should complete  C．be completed Dshould have been completed
C
考查虛擬語(yǔ)氣。句意：緊急需要要求所有任務(wù)必須最少提前兩天完成�！皊hould+have+done”意思是“本來應(yīng)該做某事，而實(shí)際沒做。Task是被完成的對(duì)象，故用被動(dòng)語(yǔ)態(tài)，選C。
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