2. 外语
  3. Fred was playing the piano while Mary and I (sing)______.

Fred was playing the piano while Mary and I (sing)______.

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问题 Fred was playing the piano while Mary and I (sing)______.
选项
答案were singing
解析 句意：弗雷德在弹钢琴，我和玛丽在唱歌。该题考查时态。while引导的时间状语从句，表示主句和从句的谓语动词动作在一段时间同时进行。用过去进行时。
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