I didn’t understand led him to be late for three times every week.
A. what it was that
B. it was where that
C. how it was that
D. why was it
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(答案→)A. what it was that
B. it was where that
C. how it was that
D. why was it
解析：understand后的宾语从句是由一个强调句型来充当的, 因强调的是主语, 用疑问词what。正常句为：I didn’t understand what led him to be late for three times every week.