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sitting to sit sat having sat
sat had sat had been sitting was sitting
with; in in; in on; on on; in
what did the old man say how did the old man come whether the old man would come who the old man went
in ordinary in common the same in similar
sat had sat had been sitting was sitting
You're welcomE. Yes，pleasE. You'd better not. No problem.
ordinary common same similar
in ordinary in common the same in similar
Yes, please You’re welcome No problem You’d better not
sat had sat had been sitting was sitting
sat had sat had been sitting was sitting
sat had sat had been sitting was sitting
sat had sat had been sitting was sitting
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