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taught have been teaching had taught have taught
the; 不填 an; the 不填; 不填 an; 不填
in a wheat field in Oxfordshire. throughout the countryside of Oxfordshire. in the English countryside in the 1970s. in all the wheat fields in the English countrysid
/DOC0/VER /IDE0/RELEVER/ /IDE1/RELEVER/ /DOC1/VER
practising speaking practising spoken to practise speaking practise spoken
the; 不填 an; the 不填; 不填 an; 不填
practicing speaking practicing spoken to practice speaking practice spoken
practicing speaking practicing spoken to practice speaking practice spoken
the; / an; / /; / an; the
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