play the 乐器:When___from the hill,the buses look small.(see)

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When___from the hill,the buses look small.(see)
为什么用呢?谁能讲述一下,并把这个知识点介绍一下。(要简明好记D)
1.If you don't leace, you'll see the problem_____by us.为什么用“settled”而不用“to be settled”
2.We'll certainly win great victory,with the Party ______us.(lead)这里为什么用不定式“to lead”
3.With all she needed____(buy), the woman left the surpermarket.这里为什么用"bought"而不用“buying”

seen

因为这里when后面的从句实际上省略了主语,而主语应当是the buses,完整的句子应当是when the buses were seen from the hill, the buses look small. 省略了the buses were就是现在的句子。