问题

Don′t stop working _____ twelve. [ ]
A: to
B: at
C: when
D:until
B: at
C: when
D:until
正确答案是:
同类题型
Do you know where Mr Brown is?—He _______ Beijing for two days.
name is Bob, is eleven years old.
May I take my pet dog with me into the cinema? ——-The rule says no. So you ______.
Who teaches _______painting?—Nobody, I teach _______.
I don’t like talking on _______ telephone; I prefer writing _______ letters.