【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，處在賓語從句中，時態(tài)不再受主句過去時的影響，用一般現(xiàn)在時態(tài)表示客觀真理或事實，故答案為D。

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