891.Later in this chapter cases will be introduced to readers _______ consumer complaints have resulted in changes in the law.
A.where
B.when
C.who
D.which
892.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
891.答案是A;先行词case在从句中充当状语，应用关系副词where，相当于in which。
892.答案是B;which引导非限制性定语从句，且作介词of的宾语。
