English verb 'to master' in past continuous - regular verbs conjugation
0 8 词汇卡 缺乏
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1st person singular, past continuous, indicative
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2nd person singular, past continuous, indicative
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3rd person singular, past continuous, indicative
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3rd person singular, past continuous, indicative
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3rd person singular, past continuous, indicative
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1st person plural, past continuous, indicative
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2nd person plural, past continuous, indicative
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3rd person plural, past continuous, indicative
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