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填空In summer,you can see plenty of butterflies ---- in garden

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填空In summer,you can see plenty of butterflies ---- in garden.a.to fly b.flying c.flies d.fly
flying 选b
一感觉(feel) 二听(listen to,hear) 三让(have,make,let) 四看(look at,see,watch,notice)
后边跟复合宾语的时候,如表示经常性的动作或者是看见时已经完成的动作用动词原形,如果表示的正在进行,则必须用doing的形式.
We saw him enter your office while you were away.
yesterday when I was walking on the street ,I saw a foreigner dancing in the middle of the street.
当这些动词后跟sb.+动词原形时变被动句必须把to加上
He is seen to draw a picture.
Tom was made to work 10 hours a day.