问题补充：
This is the best hour I can I in the past twelve years.
A. know;have had
B. remember;had
C. think of;have had
D. think out;had
答案：
A. know;have had
B. remember;had
(答案→)C. think of;have had
D. think out;had
解析：know“知道”，remember“记得，记住”，think of“记起，想起”，think out“仔细考虑”，根据题干，本句的意思应是“这是在过去十二年里我能记起的最好时光。”故应用think of。又因为根据in the past twelve years，应用现在完成时。所以本题选C。
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