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the past few years great___great changes in modern science and technology in ChinaA.witnessB.have witnessedC.witnessedD.had witnessed
题目详情
the past few years great___great changes in modern science and technology in China
A.witness
B.have witnessed
C.witnessed
D.had witnessed
A.witness
B.have witnessed
C.witnessed
D.had witnessed
▼优质解答
答案和解析
答案选B
现在完成时态
现在完成时态
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