这回句话On April fools' Day,many people play tricks on the one they familiar with.
On April fools' Day,many people play tricks on the one they familiar with.
On April fools' Day,many people play tricks on the one 【that 】they familiar with.
On April fools' Day,many people play tricks on the one 【who】 they familiar with.
On April fools' Day,many people play tricks on the one 【whom】 they familiar with.
这四句话,哪一个对?为什么?