题目内容

Our physics teacher told us that light ________ faster than sound.
A．travelB．travelsC．is travellingD．has travelled
B

试题分析：根据题干的结构，可知本句是一个宾语从句。根据宾语从句中如果从句是客观事实，不论主句是什么时态，从句都用一般现在时的用法， 本句中“光的速度比声音的速度快”是客观事实。故本题应该选B。
点评：实际上本题考查的是宾语从句的时态问题。宾语从句中的时态往往会受到主句时态的影响，但本题中考查的是特例，也就是如果从句是有关客观事实，则从句就用一般现在时。
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