问题
选择题
How time flies! It is in one and a half years _____ we'll leave this school. [ ]
A. until
B. before
C. when
D. that
答案
答案：D
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How time flies! It is in one and a half years _____ we'll leave this school. [ ]
A. until
B. before
C. when
D. that
答案：D