Jane likes singing.We oftenhear her after class. A,sings B.sing C,to sing D,sang为什么

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Jane likes singing.We oftenhear her after class. A,sings B.sing C,to sing D,sang为什么
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Jane likes singing.We oftenhear her after class. A,sings B.sing C,to sing D,sang为什么
Jane likes singing.We oftenhear her after class. A,sings B.sing C,to sing D,sang
为什么

Jane likes singing.We oftenhear her after class. A,sings B.sing C,to sing D,sang为什么
B hear sb sing 听到某人唱歌的全过程 Hear 后只加动词原形和进行时

B hear sb do 因为经常often

hear sb do/doing sth

B

B hear sb do sth .sb is heard to do sth感官动词变为被动语态要加to A heard sb doing sth 答案是A,

often表示是习惯性动作所以后面的动作行为应该是原型。
选择B sing。 sing本身就是唱歌的意思,不是所谓的什么ing形式。