He went home for lunch ___ the clock struck twelve.A while B immediately C.right away D.at onceB 为什么?

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He went home for lunch ___ the clock struck twelve.A while B immediately C.right away D.at onceB 为什么?
He went home for lunch ___ the clock struck twelve.
A while B immediately C.right away D.at once
B 为什么?

He went home for lunch ___ the clock struck twelve.A while B immediately C.right away D.at onceB 为什么?
immediately
在这里做连词,意为“一……”,该句的意思是钟一敲响12点他就回家吃午饭
如果选A时态应是过去进行时而不是过去时
而C D两个是动词词组,用在这里无法将句意连接起来