(单选题)
It was on that cold morning ______ he realized how important it was to be with his family.
A.did
B.that
C.when
D.which
参考答案：B
参考解析：
考查强调句的基本结构。句意：正是在那个寒冷的早晨，他才意识到和家人在一起是多么重要。利用还原法可知，本句应为强调句，基本结构是It is/was…that/who，本句强调成分是时间状语on that cold morning，所以应该选that。故选B。
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