He was seen ( ) upstairs. 括号里填to go 还是going ?个人觉得既可以看见他上楼的全过程又可以看见他上楼的一瞬间都说的过去但正确答案选to go!thanks a lot!能不能解释一下为什么?

He was seen to cross the street. he was up at once he was so surprised that he couldn't believe what he had seen同意句he has____surprised_____believe what he seen he was seen to drink.这个句子对吗? he was seen drinking.呢?he was seen drinking in / at a restaurant.应该用哪一个冠词呢?谢谢大家 He was seen to have entered the room.啥意识 He was often seen _________(talk)a walking the streat. He was nowhere to be seen.为什么要用不定式 he was seen ____(go) out by me he was seen to hang out.为什么要to He was seen to go into the room 这里为什么SEEN后加TO (seen)to entered the room ,he was asked to the policeman.为什么不是having been seen? he was even seen reading in the toilet.为什么用seen he was waking up是句子吗? Yesterday afternoon,he was seen ____ the classroom windowHe was seen ___ the classroom window yesterday afternoon(breaking/break) when this time was up,he was out of breath He was born there,he grew up there高精尖翻译 He was deeply i______ by what he had seen in China he was seen to come into the room last night 为什么用seen为了做老班布置的题..