______the last two and a half years,they have learned about 2000 English wordsA.At B.In C.From D.On

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______the last two and a half years,they have learned about 2000 English wordsA.At B.In C.From D.On

______the last two and a half years,they have learned about 2000 English wordsA.At B.In C.From D.On
______the last two and a half years,they have learned about 2000 English words
A.At B.In C.From D.On

______the last two and a half years,they have learned about 2000 English wordsA.At B.In C.From D.On
B
在过去的两年半内,他们已经学了大约2000个英语单词

B