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Study English, profile picture · Study English. The Present Perfect Tense in English! :) Timeline photos · Aug 31, 2019 ·. ... <看更多>
100 Examples of Present Perfect Tense in English, Learn To Speak Spanish, Learn English. englishstudyhere. English Study Here. 209k followers. ... <看更多>
The suggestion to use the past tense seems somewhat helpful. However, for the "investigated" portion, it would be better to use present perfect. Someone (1990) ... ... <看更多>