问题补充：
The old town has narrow streets and small houses are built close to each other .
A. in which
B. where
C. what
D. that
答案：
A. in which
B. where
C. what
(答案→)D. that
解析：考查定语从句，先行词为narrow streets and small houses，从句中缺少主语，故用关系代词that，选D。
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