I am sorry you’ve been waiting so long,
问题:
I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.
A.since
B.before
C.till
D.after
I am sorry you’ve been waiting so long, but it will still be some time __________ Brain gets back from his holiday.
A.since
B.before
C.till
D.after