求教一道英语选择题.Sometimes it is necessary to be careful _______ th

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求教一道英语选择题.
Sometimes it is necessary to be careful _______ the right date to sit for a test.
A.when choosing B.when you will choose
C.when you have chosen D.when you chose
应该选哪一个?为什么呢?

Sometimes it is necessary to be careful _______ the right date to sit for a test.
A. when choosing B. when you will choose
C. when you have chosen D. when you chose
应该选哪一个?为什么呢?
答：A.
译:有时候,当我们在选择正确的日子去参加考试时,小心是必要的.
不知道我翻译对不对,怎么感觉这个句子很怪似的,考试的日期又不是我们能决定的1
时间状语从句不用将来时态.排除B.这讲的是一般的事情,排除D.也没选择好.when choosing= when you/we are choosing. 尽管主句的主语不是you/we, 但这里是明显的.
要么此题还有别的理解.

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