几句被动语态 请把原句改成被动语态
2个回答

I was asked to speak at the meeting

The car was seem hit into the post

He is considered (by us) to be the best singer

These questions had to be thought over (by them)

This opportunity should be taken advantage of (by us)

Bicycles mustn't be left in the hall

This couldn't have been done by him

The cup was sure to be won by him

Pollution must be get rid of (by us)

The problem cannot be worked out by anyone

括号中的是可写可不写的

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