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 what
C．most of which
D．most of that
答案
答案：C
这题考查非限制性定语从句，代词most+of+which，指代most of the factors，句意是：植物的生长速度由许多因素影响，其中大部分不是我们能控制的。选C。