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
网友回答
A. most of them
B. most of what
(答案→)C. most of which
D. most of that
解析：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。