如果动词带两个宾语，要变成被动句的话，该用哪个宾语呢？
哪个宾语都可以，都能成为被动句的主语，取决于我们想强调哪一个宾语。

Her mother gave each child a present. [主动]
她的妈妈给了每一个孩子一个礼物。
给，送给 give - gave - given
A present was given to each child (by her mother). [被动]
（她的妈妈）给了每个孩子一个礼物。/ 礼物送给了每一个孩子。
* 这句话重点是 a present
Each child was given a present (by her mother). [被动]
（她的妈妈）给了每个孩子一个礼物。/ 每个孩子都得到一个礼物。
* 这句话重点是 each child

练习一下~
The doctor gave me a prescription.
医生给我开了处方。
变被动 —>
（1）以“我”为重点（“我”要从宾格 me 变为主格 I）
I was given a prescription (by the doctor).
（2）以“处方”为重点
A prescription was given to me (by the doctor).