问题：
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
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
A. how that was B what was it C. why it was that D. what it was that
参考答案：