every day an old man can be seen ----(clean)the street in th

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every day an old man can be seen ----(clean)the street in the morning

to clean
要领有二：
第一知道是被动,be seen
第二：
在主动的时候,感官动词,和使役动词,make,let ,have ,省略to 的时候,被动要把to 加上
再问：为什么不是cleaning
再答：当主动的时候，是这样的句子：
every day people see an old man (clean/cleaning ) the street

这就涉及到，see sb do sth 和see sb doing 的区别

do 是全过程，doing 是片刻，正在做，而本题中有时间状语，everyday ,因此，就和有often 一样，是全过程，不能是片段

另外，这个题目，谁出的，同时有every day 和in the morning ?不能用every morning?

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