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
答案 B [句意：植物的生长速度受到许多因素的影响，其中大部分是我们所不能控制的。most of which 在此引导非限制性定语从句，of表示所属关系。]