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
B:Until
C:Since
D:Before
正确答案是:
同类题型
He was walking along the street a car hit him suddenly.
We are taught that a business letter should be written in a formal style _____ in a personal one.
The policeman is still not sure ______ the young mankilled himself or was killed.
Barbara oftenmakes a schedule to get herself of what she is to do in the day