You should take the following into consideration when choose a career.我上网查的 是when choosing

You should take the following into consideration when you choose a career.（加you）
或
You should take the following into consideration when choosing a career.（去掉e加ing）
均可,意思完全一样.一个是从句做状语、而另一个是短语做状语（此时不能用动词原形choose!）