Question

【题目】None of us knew what had happened __________ they told us about it.

A. until B. when C. after D. though

Answer 1

【答案】A

【解析】试题分析：句意：直到他们告诉我们我们才知道发生了什么事情。A. until 直到……；B. when 当……；C. after 在……之后；D. though尽管。not until直到……才，根据句意，故选A。