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They first met each other ten years ago and they __good frie

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They first met each other ten years ago and they __good friends ever since.
A had been B have made C had made D have remained
为什么?
They first met each other ten years ago and they __good frie
D 从那时开始就保持着好朋友关系.
请及时采纳,多谢!
再问: 那么用had remained 可不可以?
再答: 不可以。因为ever since 是“从那时到现在”,所以必须是现在完成时,不能是过去完成时。