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Exercise1forBook3单项选择:Choosetherightwordorphrasetocompletethefollowingsentences.1.Onceapersonischosentobea,heorshehasthedutytoansweral
英语
he or she has
the past few years great___great changes in modern science and technology in ChinaA.
witnessB
.have witnessedC.witnessedD.had witnessed
英语
1
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