急the injured students in the traffic are in three hospital.Now they are being treating carefullynow可以用在现在完成时.为什么不可以用have being treated?

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急the injured students in the traffic are in three hospital.Now they are being treating carefullynow可以用在现在完成时.为什么不可以用have being treated?
急the injured students in the traffic are in three hospital.Now they are being treating carefully
now可以用在现在完成时.为什么不可以用have being treated?

急the injured students in the traffic are in three hospital.Now they are being treating carefullynow可以用在现在完成时.为什么不可以用have being treated?
now是现在进行时