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题目内容 (请给出正确答案)
单选题
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


参考答案

参考解析
解析:
有时候,谨慎选择测验日期很有必要。when引导的时间状语从句用现在进行时,即为when you are choosing,省去you are,故A项正确。其他三个选项时态均不正确。
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