he was heard_____in the next room.--to sing--sing--sings--sang

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he was heard_____in the next room.--to sing--sing--sings--sang
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he was heard_____in the next room.--to sing--sing--sings--sang
he was heard_____in the next room.
--to sing
--sing
--sings
--sang

he was heard_____in the next room.--to sing--sing--sings--sang
to sing
heard的用法是
主动:heard sb doing sth
被动:be heard to do
这里是被动,意思为他被听到在隔壁房间唱歌

to sing

选 A
hear sb do sth , hear是感官动词,直接带宾语的时候,是带省略了to的不定式。而hear放在被动语态的时候,to必须还原。

he was heard_A____in the next room.
--to sing
--sing
--sings
--sang
hear sb to do sth. 听到某人做某事
这里是被动语态
有人听到他在隔壁唱歌