---How long have you known the doctor ? ---_________he helped me three years ago.
#56019
A
When
B
Before
C
Because
D
Since
推荐题目
–Would you like to go to the concert with me? –I’d love to, ______ I’m afraid I have no time.
#58559
A
so
B
or
C
and
D
but
You won't feel happy at school you get on well with your classmates.
#55341
A
though
B
when
C
unless
D
because
