When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD.

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When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD.

When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD.
When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD.

When I was a child,my teacher told me that the earth_________ round.A.wasB.had beenC.has beenD.
is
在谈论一个客观事实或者真理时,不论什么时候谈论的,一律用一般现在时

D