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.1.She were often heard ____ this song when she was happy.

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.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
.1.She were often heard ____ this song when she was happy.
B
hear 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be heard doing,没有前者,只有后者,选B