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if I had seen his sister the night beforE. whether I had seen your sister the night beforE. did I have seen his sister the night beforE. that I saw his sister the night beforE.
A. was waited was waiting has waited have been waiting
A. was waited was waiting has waited have been waiting
helped was helping had helped have been helping
A. was waited was waiting has waited have been waiting
help helped was helping have been helping
A. was waited was waiting has waited have been waiting
will be would be have been had been
must have been can’t have been oughtn’t to be should have been
think have thought will think thought
help have been helping helped was helping
have been have gone has been has gone
woman answered, but I didn’t recognized her voicE. ---- Oh,it _______ my aunt Sister Yuanyuan. A.must be must have been can be can have been
girl answered, but I didn’t recognize the voicE. — Oh, it __________ my younger sister. She was in my room at that moment.A. must have been should have been could have been may have been
think have thought will think thought
A. was waited was waiting has waited have been waiting
So she has So has she So have I So I have
A. was waited was waiting has waited have been waiting
girl answered, but I didn’t recognize the voicE. — Oh, it __________ my younger sister. She was in my room at that moment. A.must have been should have been could have been may have been
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