He was a very quiet boy when he was young.改为同义句
He was a very quiet boy when he was young.改为同义句
He ( ) ( ) be very quiet when he was young.
He ( ) ( ) be very quiet when he was young.
英语人气：872 ℃时间：2019-12-09 22:43:22
优质解答
used to 过去常常的意思!当他年轻的时候他很安静!
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