本试题详细复习Unit6中所学习的知识点: 四.现在完成时与一般过去式的区别(视时间状语而定) 1.ago/before 1) I_______ never ________ (see) such a clever boy before . 2) We ________ (come) two years ago . 2.just/just now 1)I____________ (finish) my work just . 2)I _________ (finish) my work just now . 3.how long/when A: How long ________ you ____________ this school ? B: I ______________ this school for two years . A: When __________ you _________ here then ? B: I __________ here two years ago . (c