【題目】Our teacher said sound much more slowly than light.

A. traveled B. was traveling C. has traveled D. travels.

【答案】D

【解析】句意：我們老師說(shuō)聲音比光傳播得慢得多。“聲音的傳播速度比光的速度慢得多”屬于客觀真理，處在賓語(yǔ)從句中，時(shí)態(tài)不再受主句過(guò)去時(shí)的影響，用一般現(xiàn)在時(shí)態(tài)表示客觀真理或事實(shí)，故答案為D。

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