问题
选择题
We'll have a class meeting. Don't leave the classroom ______ 6 o'clock.
[ ]
A. to
B. until
C. at
D. in
答案
答案：B
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We'll have a class meeting. Don't leave the classroom ______ 6 o'clock.
[ ]
A. to
B. until
C. at
D. in
答案：B
