单选题
Old people tend to arise earlier in the morning because the hours ______ they can get a good night"s sleep are much more restricted.
A、
which
B、
where
C、
of which
D、
at which
【正确答案】
D
【答案解析】
[解析] 考查定语从句。前半句意为“老人倾向于在清晨早起”，后半句意为“他们能睡一晚好觉的时间越来越少”，分析可知后面是hours的定语从句，短语为at the hours，故选D。
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