— Who is Jerry Cooper? 　

— ______? I saw you shaking hands with him at the meeting. 　 [ ]

A. Don't you meet him yet

B. Hadn't you met him yet 　

C. Didn't you meet him yet

D. Haven't you met him yet

水分测定试验中，铁矿石恒重检测时间间隔为（）分钟，无烟煤的为（）分钟。