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has been to has come to has been in has arrived in
has so much been done have so much been done has been done so much so much has been done
has been to has come to has been in came to
has been to has come to has been in has gone to
have sent have been sent has been sent has sent
has repaired is being repaired has been repaired is repairing
has been to have been in have gone to has come to
came; has been teaching has been; has been teaching came; have been teaching has gone; have been teaching
has come has been to have been in have come to
been to come to arrived in been in
has been in has been to has come to came to
when has Hongkong returned to China? how long Hongkong has been back in China? when had Hongkong been back in China? how long Hongkong had returned to China?
has been in have been in went to has gone to
been to been in gone to gone in
had he been has he been had he gone has he gone
been to been in gone to gone in
has done so much has been done so much so much has been done has so much been done
has come，see，returning has been，seeing，to return has been，seeing，return has returned，see，returning
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