问题
选择题
The growing speed of a plant is influenced by a number of factors, _______ are beyond our control.
A．most of them
B．most of which
C．most of what
D．most of that
答案
答案：B
考查定语从句。先行词为a number of factors，他们当中的，应用 most of which 。句意为：植物的增长速度受许多因素的影响，大多数超过了我的控制范围。故选B。