单选题 My mind wasn't on what he was saying so I'm afraid I ______ half of it.
A. was missing B. had missed C. will miss D. missed

【正确答案】 D
【答案解析】时态和语境。全句意为：“我的心思没在他说的话上，所以恐怕他说的话我有一半没听到。”整个事情是过去的事，且是做过的事，所以选一般过去时D。