he wasn't heard to sing in the classroom.为什么是to sing,不是singing或其他
人气:316 ℃ 时间:2020-03-24 04:07:22
解答
还原一下句子:We didn't hear him sing in the classroom.句子使用了 hear sb do sth 改为被动语态是:sb be heard to do sth,如果原句是:We didn't hear him singing in the classroom.改为被动语态就是:He wasn...
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