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was happened had happened happened had been happened
happened has happened took place takes place
had had；had happened were having；happened had；was happening would have；happened
did the earthquake happen the earthquake happened was the earthquake happened the earthquake was happened
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all of a sudden in a hurry to our surprise in a while
happening were happening has happened had happened
extraordinary something something extraordinary anything extraordinary extraordinary anything
to happen happening happened being happened
A；the An；the An；an The；an
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