Mr. Green didn’t understand made his daughter so absent-minded.
A. how that was B what was it C. why it was that D. what it was that
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解析：考查强调句型的特殊疑问句组成的宾语从句。本题是强调句型的特殊疑问句的宾语从句，本题强调的是主语what。而任何一个宾语从句都使用陈述语序，排除了ABC项；句意：Mr Green不了解究竟是说明让他的女儿注意力分散。故D正确。