hear sb.to do是全过程
hear sb.doing sth.是指一瞬间的动作
Sally is often heard _____in her sitting room.A sing B to sing 为什么选B
Sally is often heard _____in her sitting room.A sing B to sing 为什么选B
英语人气：851 ℃时间：2019-08-19 12:51:36
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