Few people know the fact was not until 1936 that basketball became a regular part of the

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A. it that
(答案→)B. that it
C. that
D. it
解析：
本题考查同位语从句。分析句子结构是做对该题的关键，the fact后的句子是对fact内容的进一步解释，是同位语从句，语意完整，用that引导，而且that不可省略；由句中“not until 1936 that...”可知是not...until结构的强调句型，应是it was not until...that，故选B。