答案是A,没问题.
这个句子表达发生在过去的事情,因为从句有一般过去时 shouted.按常理,“我”当时大声喊他,他当时回头,或者后来回头,但就算他回头的时间再拖后,也不可能到“现在”（指表达这句话的时候）.
按照时态一致的原则,前后没有时间变化的情况下,前面是一般过去时shouted,后面也用一般过去时did.
not until i shouted at the top of my voice,___ his head.
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