问题补充：
It was last Saturday we visited the History Museum.
A. which
B. and
C. where
D. that
答案：
A. which
B. and
C. where
(答案→)D. that
解析：
试题分析:考查强调句型。分析结构可知此处是强调句型，即去掉 it was 和空格 ，句子意思完整，所以填that。强调句型：It is / was + 被强调部分+that /who，所以D选项正确。句意：是在上周六我们去的历史博物馆。
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