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The experts from the zoo were convinced that the animal was a puma,but where had it come from
为什么不用where did it come from
人气:477 ℃ 时间:2019-11-23 04:46:29
解答
had come是过去完成时,表示过去的过去发生的动作.原句中were convinced动作发生在come之后.
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