The farmers often grew vegetables in the field 保持句意不变The farmers _______ ______ grow vegetables in the field

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Thefarmersoftengrewvegetablesinthefield保持句意不变Thefarmers_____________growvegetablesinthefieldThefarme

The farmers often grew vegetables in the field 保持句意不变The farmers _______ ______ grow vegetables in the field
The farmers often grew vegetables in the field 保持句意不变
The farmers _______ ______ grow vegetables in the field

The farmers often grew vegetables in the field 保持句意不变The farmers _______ ______ grow vegetables in the field
the farmers used to

确定原句是这样的吗?我印象中表示频率的单词后面一般是跟动词原型的