问题
You look unhappy, what’s happening, my son? —I’m wondering how long it’ll be________ we come to China again.
A:since
B:when
C:before
D:after
B:when
C:before
D:after
正确答案是：
同类题型
I’m interested ______ running. I can run a kilometer in three minutes. [ ]
Tony is such a selfish person. —I agree. Never again________with him.
There are_______ seasons in a year． Winter is_________season．
You have made great progress recently. —______.
Oh, Mrs. Black, your wallet looks nice, is it new?—No, I ________ it for two years.