问题
Those boys didn’t start the work _____ their teacher come back. [ ]
A: until
B: while
C: as soon as
D: if
B: while
C: as soon as
D: if
正确答案是：
同类题型
I get _____ at seven o’clock in the morning. [ ]
What are you doing right now?—The same ________ you. Doing homework.[ ]
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This key ring doesn’t belong to _______, maybe it’s ________.