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(shí)態(tài)問題。當(dāng)主句的謂語動(dòng)詞是一般現(xiàn)在時(shí)時(shí)，其賓語從句的時(shí)態(tài)可以是任何適當(dāng)?shù)臅r(shí)態(tài)。所以，賓語從句的時(shí)態(tài)應(yīng)根據(jù)實(shí)際情況而定。當(dāng)主句的謂語動(dòng)詞的時(shí)態(tài)是一般過去時(shí)的時(shí)候，其賓語從句的時(shí)態(tài)一般要用任一適當(dāng)?shù)倪^去時(shí)態(tài)。但是當(dāng)賓語從句是表達(dá)客觀真理和規(guī)律的句子時(shí)，其時(shí)態(tài)仍舊用一般現(xiàn)在時(shí)。
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