I have lots the pen __ my mother gave me yesterday 选项that; which;who;whose;whom

问题描述:

I have lots the pen __ my mother gave me yesterday 选项that; which;who;whose;whom
并讲一下who;whose;whom的区别?

I have lost the pen that my mother gave me yesterday.
who “谁”,用作主语,有时宾语也可用;
whose “谁的”,后面必须跟名词;
whom “谁”,宾格,只能作宾语或介宾