The project ______ last month but unfortunately it had to be prolonged because of the financial problem.
A．needn’t have been finishedB．shouldn’t have finished
C．could have been finished D．must have finished
C

試題分析：句意：這個(gè)項(xiàng)目本來(lái)是可以在上個(gè)月完成，但是不幸的是，因?yàn)樨?cái)政問(wèn)題，它不得不被延期。從but unfortunately it had to be prolonged because of the financial problem.可知這是對(duì)過(guò)去的虛擬，用could have done表示“本可以做卻沒有做”，所以選C.
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