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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。
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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