---It’s a long time _____ I saw you last.---Yes, and what a pity it is now that it will be a long time _______ we see each other again.
#33410
A
before; since
B
since; when
C
since; before
D
when; before
推荐题目
So although Fleming discovered penicillin, it was over a decade ___________someone else turned penicillin into the great drug of the 20th century.
#34272
A
when
B
that
C
before
D
unless
I would appreciate it you call back this afternoon for the doctor’s appointment.
#31617
A
until
B
if
C
when
D
that