单选The secong book was __ by August 1952,but two years later,the end was still nowhere insight.
A.completedB.tohavecompletedC.tocompleteD.tohavebeencompleted为何不选D?...
A.completed B.to have completed C.to complete D.to have been completed
为何不选D? 展开
为何不选D? 展开
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