推荐回答（4个）
题目要求将句子变为被动语态，被动语态的结构为：
动词的承受者，作为主语（该主语必须明确，而不能含糊）+助动词/情态动词+be/been+动词的过去分词形式+宾语/宾语补足语。
1、This book has been given to Maria. 被动语态的主语，是动作的承受者。
2、The flower must be watered every. water，在这里作动词，意思是“浇灌”。
3、The light blue dresses has been sold out. 此处应该用单数形式，表示这种类型的衣服已被售罄。
4、Trees must not be planted in very dry earth.
5、A hole can be digged here.
6、It hasn't to be done by you at the moment.
可以，
为什么我看不到题目呢？
麻烦发一下，或补充一下
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