had been working 要注意是过去一直在进行的
have finished
had to go
ought to buy
should have telephoned
will have worked
have finished
had to go
ought to buy
should have telephoned
will have worked 将来完成时
have finished
had to go
ought to buy
should have telephone
had worked
have finished
had to go
ought to buy
should have been telephoned
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