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had; repair had; repairing had; repaired had; to repair
have been was
had been had gone
has last seen had last seen last seen was last seeing
has last seen had last seen last seen was last seeing
have been had gone had been was
had finished; had finished finished; had finished had finished; finished finished; finished
B.C.D四个选项中，选出可以填入空白处的最佳选项。 --Where have you been recently? ---I_____in Hangzhou on business for a week last month. A. have been was had been had gone
Did they have, did Did they have, had Had they, had Had they, did
so it had been so had it been what it had been as it had been
have tried; have never forgiven had tried; never forgave had tried; have never forgiven have tried; had never forgiven
I had walked; last week. he had walked; that week. I walked; last week he has walked; last week.
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