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一、 完成句子:1.We_______(learn) two thousand English words by the

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一、 完成句子:
1.We_______(learn) two thousand English words by the time I went to middle school.
2.I_______(know) him when I was a student.
3.When we arrived at the station,they_______(wait) for more than twenty minutes.
4.One of the men didn’t move because he_________(break) his legs.
5.By yesterday evening ,he________(write) that important letter.
6.I thought I _______(meet) the man before.
7.By six o’clock,they_________(work) for ten hours.
8.I went to Feng Tingting’s house,but she______(go) out.
9.I____________(not understand) the problem when class over.
have learned
have known
have waited
broke
has been writing
had met
had worked
had gone
have not understood