【ivy】評論
Greg didn’t sleep well last night because he heard someone play the recorder all night. (Greg 昨晚睡不好，因為他聽到有人整晚都在播放錄音機。)because 後面接完整句子主詞S + 動詞., 前面已說明時間為昨晚last night，動詞用過去式 heard 聽到, (A) has heard； played --> has heard 有聽說過的意思, (B) heard； play --> O (C) heard； is playing --> 後面的is playing是現在進行式與句子不符合。(D) hears； play --> 時態不對