When the girl _D was singing__ a teacher came into the classroom
當(dāng)女孩在唱歌時(shí),老師走進(jìn)了教室.
主句動(dòng)作發(fā)生時(shí),從句動(dòng)作sing在進(jìn)行,所以用過(guò)去進(jìn)行時(shí)
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
英語(yǔ)人氣：912 ℃時(shí)間：2019-08-20 01:50:58
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