It was raining heavily and they found that a stream had formed in the field.had formed 过去完成时?

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It was raining heavily and they found that a stream had formed in the field.had formed 过去完成时?
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It was raining heavily and they found that a stream had formed in the field.had formed 过去完成时?
It was raining heavily and they found that a stream had formed in the field.
had formed
过去完成时?

It was raining heavily and they found that a stream had formed in the field.had formed 过去完成时?

It was raining heavily and they found that a stream had formed in the field.
他们发现的时候 是已经 成小河了,所以要用过去时的过去,过去完成时。