用所给单词适当形式填A:How many times()the doctor()(be)to America?B:He()(be)there three times.A:When()he()(go)there B:He()(go)there in1999,2001and2004.

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用所给单词适当形式填A:How many times()the doctor()(be)to America?B:He()(be)there three times.A:When()he()(go)there B:He()(go)there in1999,2001and2004.

用所给单词适当形式填A:How many times()the doctor()(be)to America?B:He()(be)there three times.A:When()he()(go)there B:He()(go)there in1999,2001and2004.
用所给单词适当形式填A:How many times()the doctor()(be)to America?B:He()(be)there three times.
A:When()he()(go)there B:He()(go)there in1999,2001and2004.

用所给单词适当形式填A:How many times()the doctor()(be)to America?B:He()(be)there three times.A:When()he()(go)there B:He()(go)there in1999,2001and2004.
How many times(has)the doctor(been)(be)to America?B:He(has been)(be)there three times.
When(did)he(go )(go)there B:He(went)(go)there in1999,2001and2004.

1.has been has been the doctor第三人称,谓语用单数,而且是完成时,have been
2.did go went
过去式,根据后面的时间