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We were just about to jump into the river _____a passer-by s

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We were just about to jump into the river _____a passer-by stopped me.
A when
B while
C however
D at that time
选A 为何?
when在这里类似并列连词,表at that time,常用于be about to do ...when,hardly...when等句型中.如:We were swimming in the lake when suddenly the storm started.
while 表“当……时候”时,后面的句子动词一般是延续性动词.
however,然而,在句子中意思不通.它必须前后有逗号.
at that time 也不能在句首链接一个句子.
因此,选A.