they must promise --- their new pets.A kind to B being kind to C to be kind of D to be kind to

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theymustpromise---theirnewpets.AkindtoBbeingkindtoCtobekindofDtobekindtotheymustpromise---theirnewpe

they must promise --- their new pets.A kind to B being kind to C to be kind of D to be kind to
they must promise --- their new pets.A kind to B being kind to C to be kind of D to be kind to

they must promise --- their new pets.A kind to B being kind to C to be kind of D to be kind to
D 涉及两个固定搭配
promise to do
be kind to

D

promise to do sth 承诺做某事
他们必须承诺善待他们的宠物。

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D