since when用法

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since when用法
That was in 1929,since______ things have been better.
A.which B.when
为什么答案选 B when 不选 A which 呢

这是定语从句,先行词是1929,things have been better中主谓宾俱全,因此1929在句中做时间状语.不是since when的用法

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