No conclusion  _______  about the new product until the result of the experiment has been announced.
A．will be drawn B．was drawnC．has been drawnD．is drawn
A
本題考查時態(tài)和語態(tài)。結(jié)合until從句中的時態(tài)是現(xiàn)在完成時表示將來，所以主句要用將來時。
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