Fred was playing the piano while Mary and I (sing)______.were singingwhile引导时间状语

游客2023-09-23 53

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

选项

答案 were singing

解析 while引导时间状语从句，表示主句和从句的谓语动词动作在一段时间内同时进行。故此处应用过去进行时。

转载请注明原文地址:http://tihaiku.com/zcyy/3038815.html

相关试题推荐

随机试题

最新回复(0)