Question

Not until he took off his dark glasses ___________ he was a

Answer 1

B

考查时态及主谓倒装，句意：直到他摘下他的墨镜时，我才发现他是一个著名的影星。Not until谓语句首时，主语采用部分倒装，助动词提前。结合语境可知主语描述的是过去某时的动作，助动词用一般过去时态。选B。