Later in this chapter cases will be introduced to readers consumer plaints have resulted in changes in the law.
A. where
B. when
C. who
D. which
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A. where
B. when
C. who
D. which
解析： 本题考查定语从句的用法。先行词是cases ，在……情况下应用 in this /that case ,注意介词不可少，in which =where 。