Thesquareboxhasadoor,______therear

The square box has a door,______there are some buttons.A.beside itB.beside whichC.beside thatD.beside what

参考答案：
B解析考查定语从句。句中先行词为door，在句中作beside的宾语。句意：正方形盒子有一个门，在它旁边有一些按钮。