My father is a policeman. He in that station since 2008.
A:works
B:has worked
C:will work
D:worked
下列不符合有教养的人的基本要求的是( )
骑自行车上坡前往往要加紧蹬几下,这样做是为( )
一对色盲夫妇,生育了一个XXY的色盲男孩,下列哪项不可能是致病来源( )