–I’m sure John ____ the first prize in the final. –I think so. He ____ for it for monthsA.will win; is preparingB.would win; was preparingC.would win; had been preparingD.will win; has been preparing
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D解析考查时态。根据句意可知the final是将来的事情。所以第一空使用将来时；for months通常都是与完成时连用，本题强调一直在准备，所以使用现在完成进行时。句意：-我敢肯定John将会在期末考试里赢得第一名。-我也这样认为。他一直都在为此做准备。