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题目内容
（兰州大学大学英语4）
16.(4分)I will hold your note until Christmas Day, ________ you certainly will have received your allowance.
A. by that time
B. at that time
C. by which time
D. at which time
A. by that time
B. at that time
C. by which time
D. at which time
参考答案
