the old scientist with his two students__the prize in the Great Hall of the People.a.was seen accept b.were seen accept c.was seen to accept d.were seen to accept写出原因!

the old scientist with his two students__the prize in the Great Hall of the People.a.was seen accept b.were seen accept c.was seen to accept d.were seen to accept写出原因!
the old scientist with his two students__the prize in the Great Hall of the People.
a.was seen accept
b.were seen accept
c.was seen to accept
d.were seen to accept
写出原因!

the old scientist with his two students__the prize in the Great Hall of the People.a.was seen accept b.were seen accept c.was seen to accept d.were seen to accept写出原因!
C
主语+ with+ 名词,代词 + 谓语
这个句型中的谓语应该和前面的主语在数上保持一致,这里主语是 the old scientist 是单数,所以这么选； A 的结构有问题 was seen to accept
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C A介词B 主语由A决定， 排除BD
被看到做某事 be seen to do...
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C
这个老科学家和他的两个学生被看见在人民大会堂里接受了奖励
the old scientist with his two students 这里主语是the old scientist ,而his two students是伴随状态，
所以主语为单数，BD不对
因是被动语态，动词不定式一定要加　to
~~~~~~~~~~~~~~~~~~~~~祝你进步，...

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C
这个老科学家和他的两个学生被看见在人民大会堂里接受了奖励
the old scientist with his two students 这里主语是the old scientist ,而his two students是伴随状态，
所以主语为单数，BD不对
因是被动语态，动词不定式一定要加　to
~~~~~~~~~~~~~~~~~~~~~祝你进步，有疑问可追问，请及时采纳~~~~~~~~~~~~~~~~~~~~

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c.was seen to accept
主语是the old scientist ，而with his two students只是伴随而已，所以谓语用单数。
see 是不带to 的不定式，被动语态要还原to