---How long has your brother been workin
题型:选择题
问题:
---How long has your brother been working in this factory?
---_____he dropped from school in 2010.
A.When
B.Until
C.Since
D.Before
---How long has your brother been working in this factory?
---_____he dropped from school in 2010.
A.When
B.Until
C.Since
D.Before