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Anna is often heard ___songs in her rooms

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Anna is often heard ___songs in her rooms
A sung
B singing
C sing
D to sing
其实答案选D 为什么呢?
因为这里是被动语态,is heard 表示 被听到 .
其他的单词像:see,watch,notice,feel,observe在被动语态里to 也要还原.
如:He is often seen to play computer games in his room .他经常在房间里被看到玩电脑游戏.
希望这些能帮到你 !:)