he made up his mind to take a trip to Europe?
A. When was it that
B. to That was it when
C. That it was when
D. When it was that
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(答案→)A. When was it that
B. to That was it when
C. That it was when
D. When it was that
解析：考查强调句型的特殊疑问句。强调句型的基本结构为：It is/was被强调成分that/who其它成分；强调句型的最大特点是把it is/was…that/who…去掉，句子仍然成立。本题考查了强调句型的特殊疑问句，是最被强调部分进行的提问。句意：究竟是在什么时候，他下定决心去欧洲旅游的？故A正确。