將下列句子改成現(xiàn)在完成時(shí),注意保持意思不變。

2. Mr. Liu became a teacher in 2000.

 Mr. Liu                a teacher for               .

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 詞語運(yùn)用。 

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閱讀短文，從方框中選擇適當(dāng)?shù)脑~并用其正確形式填空，使短文通順、意思完整。請(qǐng)將答案寫在下面題號(hào)后的橫線上。每空限填一詞，每詞限用一次。方框中有兩個(gè)詞是多余的。

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