The teacher told us that light ______ faster than sound.
A．traveledB．had traveledC．is travelingD．travels
D
考查時態(tài)。句意：老師告訴我們光傳播比聲音快。結(jié)合語境可知從句敘述的是一個客觀存在的事實，故用一般現(xiàn)在時態(tài)，選D。
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