No conclusion about the new product until the result of the experiment has been announced.
A. will be drawn
B. was drawn
C. has been drawn
D. is drawn
网友回答
(答案→)A. will be drawn
B. was drawn
C. has been drawn
D. is drawn
解析：本题考查时态和语态。结合until从句中的时态是现在完成时表示将来，所以主句要用将来时。