问题: 用所给单词适当形式填空
1.You can't pass an exam without______(prepare)
2.This place is ______(sit)for us to have a picnic.
3.The lake was _______(freeze)over until late srring
解答:
1.You can't pass an exam without _preparing_____(prepare)
2.This place is _sat_____(sit)for us to have a picnic.
3.The lake was __frozen_____(freeze)over until late srring
without是介词，后加动名词
2和3都是被动语态，不规则动词
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