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
考查非限制性定语从句的“代词＋which”的用法，原句可还原成…Most of the growing speed of a plant are beyond our control.