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