麻烦介绍下合适用where when 介词加which that which what答:Who is the boy (that或which) you were talking with amoment ago?3) 当先行词是all, everything, something, nothing等不定代词,或被first, last, only, few, much, some, any, no以及形容词最高级等词修饰时,应该用关系代词that,不用which。例如:I am interested in all that youhave...