How long will it be the Stock(股票) Market returns to normal?At least one year I g

问题补充：

--- How long will it be the Stock(股票) Market returns to normal?

--- At least one year, I guess.

A. before

B. when

C. until

D. that

答案：

(答案→)A. before

B. when

C. until

D. that

解析：句意：股票市场需要多久恢复正常呢？我猜最少得一年。before表示“在…之前”；when “当…时候”； until“直到…才”；根据句意可知，选A