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一道英语选择题Theyprinting500copiesbytheendoflastmonth.A.hadfinishedB.havefinishedC.hadbeenfinishedD.finished随便说下原因噢~``谢啦``

题目详情
一道英语选择题
They ____ printing 500 copies by the end of last month.
A.had finished B.have finished C.had been finished D.finished
随便说下原因噢~``谢啦``
▼优质解答
答案和解析
A
by the end of last month指在上个月前 过去的过去
是过去完成式