Mrs Brown gave us several cases language travel students were likely to get enough language practice .
A. where
B. which
C. as
D. what
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(答案→)A. where
B. which
C. as
D. what
解析：考查定语从句。先行词是cases，后面的读细节句子很完整，故使用关系副词，选项中只有where。BC都是关系代词，要在句中主语，宾语；what不能做关系词。故A正确。