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

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

出自：兰州大学大学英语4

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