单选题
The (discount) houses were first established in that period of time (where) people s (purchasing) power was (low).
A、
discount
B、
where
C、
purchasing
D、
low
【正确答案】
B
【答案解析】
[解析] 应改为when。本题定语从句的先行词是that period of time，修饰它的定语从句却用了表示地点的关系副词where来引导，显然错了，应改用表示时间的关系副词when。
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