we are living in an age( )many things are done on computers a which b that c where d when还有一道类似的也不太明白we are living in an age（ which或that） we have a lot of things to learn about 第一道为什么不能用that或which.第二道为什么不能用when介词+关系代词（which）=where或when怎么理解
问题描述：
we are living in an age( )many things are done on computers a which b that c where d when
还有一道类似的也不太明白
we are living in an age（ which或that） we have a lot of things to learn about
第一道为什么不能用that或which.
第二道为什么不能用when
介词+关系代词（which）=where或when怎么理解
答
第一个句子后面的从句少了时间状语,所以引导词用的是when,后面的句子完整的话就是Many things are done on computers in the age.你看后面这个句子不少主谓宾,只是少状语.而第二个句子后面的从句少了宾语,所以引导词...