问题
选择题
No conclusion _________ about the new product until the result of the experiment has been announced.
A．is drawn
B．was drawn
C．will be drawn
D．has been drawn
答案
答案：C
题目分析： 句意：直到实验结果被宣布才能得出关于新产品的结论。Until引导的是时间状语从句，用的是现在完成时，代替将来完成时，所以主语用一般将来时，选C。