问题
选择题
Marry had made up her mind to give it up, but on _________ second thought she determined to have __________ third try.
A．/ ; /
B．a; a
C．the; a
D．/ ; a
答案
答案：D
题目分析:考查冠词用法。固定短语on second thought或on second thoughts “转念一想”；序数词强调“再一，又一”时前面用不定冠词，故D选项正确。句意：玛丽下决心放弃了，但是转念一想她决心再试一次。