As soom sa this was done,they cooke a meal over an open fire.请问这句话中,为什么要用was done?而不用did?

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As soom sa this was done,they cooke a meal over an open fire.请问这句话中,为什么要用was done?而不用did?
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As soom sa this was done,they cooke a meal over an open fire.请问这句话中,为什么要用was done?而不用did?
As soom sa this was done,they cooke a meal over an open fire.
请问这句话中,为什么要用was done?而不用did?

As soom sa this was done,they cooke a meal over an open fire.请问这句话中,为什么要用was done?而不用did?
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