问题补充：
Johnson had made up his mind to give it up，but onsecond thought he determined to try third time.
A. /；a
B. /；/
C. a；a
D. the；a
答案：
(答案→)A. /；a
B. /；/
C. a；a
D. the；a
解析：本题考查冠词习惯用语和冠词的基本用法。on second thought意为“进一步考虑后；经再三考虑”；try a third time “a+序数词”表示“又一；再一”。
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