at present technology is developing fast that tall building is being pulled down为什么加ing啊,而不是用ed 不是被动关系吗第二个能不能直接is pulling down啊being在这是啥用法啊.

at present 用at present造句, at present怎么发音? at the present at present怎么读 at the present 用at present 造句 用at present造句 at present是什么意思 at present的同义词 be present at意思+++++++++++++ at present是什么意思? at present 同义短语 at present 与 for the present 区别 at the present time与at present 的区别 at the present time ,at present ,now的区别` at the present time 和at present一个意思吗 Treasures at present the person