否定句
they used not to keep pets
they used to keep no pet
疑问句
一般疑问句did they use to keep pets
特殊疑问句what did they use to keep
用they used to keep pets.否定,疑问各造两句话,翻译
用they used to keep pets.否定,疑问各造两句话,翻译
英语人气:635 ℃时间:2020-03-19 15:46:40
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