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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
was happening happens has happened happened
to be working to work working worked
extraordinary something something extraordinary anything extraordinary extraordinary anything
had would have were having are having
at an end in the end at the end by the end
chance surprise hope escape
to happen happening happened being happened
shake shaking shook shaken
A；the An；the An；an The；an
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