The teacher told them since light ____ faster than sound,lighting ____ to go before thunder.A.travelled,appeared B.travels,appears C.travels,will appear D.travelled,would appear

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The teacher told them since light ____ faster than sound,lighting ____ to go before thunder.A.travelled,appeared B.travels,appears C.travels,will appear D.travelled,would appear
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The teacher told them since light ____ faster than sound,lighting ____ to go before thunder.A.travelled,appeared B.travels,appears C.travels,will appear D.travelled,would appear
The teacher told them since light ____ faster than sound,lighting ____ to go before thunder.
A.travelled,appeared
B.travels,appears
C.travels,will appear
D.travelled,would appear

The teacher told them since light ____ faster than sound,lighting ____ to go before thunder.A.travelled,appeared B.travels,appears C.travels,will appear D.travelled,would appear
从句是真理,时态不受谓语影响,但前者是一般事实/真理用一般时,后者强调必然性用will并非将来时

B 楼上正解 客观现实规律都用一般现在时

C项应该是正确答案,必须得,其实道理很简单,主将从现吗。

应该是B吧
自然规律 一般都是用现在一般时的