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of it/its building a nest in the chimney. 她很為小鳥(niǎo)擔(dān)憂(yōu),為它在煙囪中筑巢而感到害怕。 A:Why, it’s eleven o’clock already. B:I’m surprised at it being so late. 1) 作主語(yǔ) His/He ing home late worries his other. John’s /John ing here will get us out of 。 2) 作動(dòng)詞或短語(yǔ)動(dòng)詞的賓語(yǔ) I don’t remember him/his giving me that book. 我記得他給過(guò)我那本書(shū)。 Do you mind my smoking?我抽煙你介意嗎? I would appreciate back this afternoon.(MET’92,答案是C) to call call calling ’re calling Her parents insisted on her studying medicine