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Don’tdisturbme.Ilettersallmorningandhavewrittentensofar.A.havewrittenB.amwritingC.waswritingD.havebeenwriting

题目详情
Don’t disturb me. I_______ letters all morning and have written ten so far.
A.have written B.am writing C.was writing D.have been writing
▼优质解答
答案和解析
D