While he was writing a letter to his pen-pal, his brother came in.
整个时态是过去时,while后面要用be doing.
while he__________(write)a letter to his pen-pal,his brother_________(come)in.怎么填
while he__________(write)a letter to his pen-pal,his brother_________(come)in.怎么填
英语人气：721 ℃时间：2020-03-23 07:40:00
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