the boys planted some trees on the hill yesterday.改为同义句 some trees — — on the hill by ththe boys planted some trees on the hill yesterday.改为同义句some trees — — on the hill by the boys yesterday

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the boys planted some trees on the hill yesterday.改为同义句 some trees — — on the hill by th
the boys planted some trees on the hill yesterday.改为同义句
some trees — — on the hill by the boys yesterday

were planted(be done表被动)