问题
选择题
—When did your father come back last night?
—He didn't come back _____ he finished all the work. [ ]
A. until
B. while
C. if
答案
答案：A
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—When did your father come back last night?
—He didn't come back _____ he finished all the work. [ ]
A. until
B. while
C. if
答案：A