teaching is a job__you are doing something serious but interest为什么填where?其余四个选项 which when that
问题描述：
teaching is a job__you are doing something serious but interest为什么填where?
其余四个选项 which when that
答
你把这句话变一下：
you are doing something serious but interest in 在什么什么方面
这里的什么什么方面就是指teaching这件事，
所以这里用where比较合适
答
where=in which
后面存在be interested ,要跟in，所以是上面两种填法。
答
可以分成两句看，teaching is a job和you are doing something serious but interest in the job.
合在一起，省略后面的job，把in提前，变成从句，要加上which连接，变成teaching is a job in which you are doing something serious but interest.
最后，where=in which所以填这个比较合适
答
选where是表示在教育这一工作里你所做的事是既严肃又有趣的
答
词组be interest in的搭配,in which在英语中是可以等同于where,选which,that缺少成分,选when字面翻译不合乎情理,该句的中文翻译应该是:教书是一项艰巨但是有趣的工作!