The physics teacher once said that we first _________ the lightning followed by thunders because light _________ faster than sound.
A.see; travelledB.saw; travelledC.saw; travelsD.see; travels在线课程C
解析:
第一个空用saw与主语的时态一致;
第二个表示客观真理,仍然要用一般现在时。
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