the man was seen ____ away with something

the man was seen ____ away with something

题目
the man was seen ____ away with something
A to run B run C being runC to be running
请问这里为什么填to run?
答案
答案 A to run.see是感官动词,主动句里用于“sb saw sb do sth"时,宾补do sth省略to,但变成被动句时要加上to.在感官动词(see,hear,feel,listen to ,notice,watch,observe等)和使役动词(let,have,make )后的补足语中,不定式不带to.但这类句子变成被动语态时,必须带to.
I saw him play in the park.
→He was seen to play in the park.
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