1.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选哪一个and WHY?

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1.Sometimesitisnecessarytobecareful_____therightdatetositforatest.A.whenchoosingB.whenyouwillchooseC

1.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选哪一个and WHY?
1.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
选哪一个and WHY?

1.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选哪一个and WHY?
A
这句话完整说起来其实就是when you are choosing...
这个时候如果主语和主句是一致的,可以省略you are

C
主句it作主语,排除A
从句不用将来时,排除B
不用过去时,排除D

选A 引文it is necessary 后面的时间状语从句要用一般现代时,BCD都不符合,when choosing是省略主语的一种用法

排除C D,与句意不符(C 选项是完成时, D 选项是过去时) ,选择题选最佳选项,所以选A
当你选择测试日期时有时需要小心