When the girl _D was singing__ a teacher came into the classroom
当女孩在唱歌时,老师走进了教室.
主句动作发生时,从句动作sing在进行,所以用过去进行时
When the girl ___ a teacher came into the classroom
When the girl ___ a teacher came into the classroom
A sang
B sings
C to sing
D was singing
A sang
B sings
C to sing
D was singing
英语人气:753 ℃时间:2019-08-20 01:50:58
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