1.David has already come back from Nanjing.（改为否定句）
1.David has already come back from Nanjing.（改为否定句）
David______come back from Nanjing______.
2.I have felt a bit lonely since I moved into that house (对 since I moved into that house 提问)
_____ _____have you felt a bit lonely
David______come back from Nanjing______.
2.I have felt a bit lonely since I moved into that house (对 since I moved into that house 提问)
_____ _____have you felt a bit lonely
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