Our teacher said sound___much more slowly than light.
A．was traveling B．travels
C．has traveledD．traveled
B
此題考查賓語從句的時態(tài)問題。當(dāng)主句的謂語動詞是一般現(xiàn)在時時，其賓語從句的時態(tài)可以是任何適當(dāng)?shù)臅r態(tài)。所以，賓語從句的時態(tài)應(yīng)根據(jù)實際情況而定。當(dāng)主句的謂語動詞的時態(tài)是一般過去時的時候，其賓語從句的時態(tài)一般要用任一適當(dāng)?shù)倪^去時態(tài)。但是當(dāng)賓語從句是表達客觀真理和規(guī)律的句子時，其時態(tài)仍舊用一般現(xiàn)在時。
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