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这一题选哪个?The teacher told the students that since light___ fas

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这一题选哪个?
The teacher told the students that since light___ faster than sound,lighting___ to go before thunder.
A traveled; appeared B travels; appears
C travels; will appear D traveled; would appear
最好说明一下理由哈,特别是第二空,
第一空我知道是常规用一般现在时
但第二空怎么理解?
B 自然常规,所以一般现在时