Fred was playing the piano while Mary and I (sing)______.were singing句意:弗雷德在弹钢琴,

游客2023-09-26  25

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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