我的语法不太好。觉得“has been slow down”的slow down 是动词短语,
是不是应该变成has been slowing down呢?
一起切磋学习哈。。:)
我的语法不太好。觉得“has been slow down”的slow down 是动词短语,
是不是应该变成has been slowing down呢?
一起切磋学习哈。。:)
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