My mind wasn't on what he was saying so I'm afraid I half of it. A. was missingB. had mis

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A. was missing
B. had missed
C. will miss
(答案→)D. missed
解析：考查时态。句意：我的思维不在他所说的内容上，所以我担心我会错过一半以上的内容。根据句意说明这一切都是过去发生的事情故使用一般过去时。且是在他说了以后，那么不应该使用过去完成时。故D正确。