题目

.1.She were often heard ____ this song when she was happy.
1.She were often heard ____ this song when she was happy.
a.sang b.singing c.sung d.to be singing

提问时间：2020-06-13

答案

Bhear sb.do 听见某人做某事（这个do是不带to的动词不定式）,在变为被动语态时,to不得省略另外,还有hear sb.doing （这个doing是现在分词）,表示听见某人正在做某事题目是被动语态,要么变为be heard to sing,要么是b...