作业帮The population _has increased________ from 1.6 billion to 1.8 billion.中为什么要加has?（为什么要用现在完成时）
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The population _has increased________ from 1.6 billion to 1.8 billion.中为什么要加has?（为什么要用现在完成时）
The population _has increased________ from 1.6 billion to 1.8 billion.中为什么要加has?
（为什么要用现在完成时）
The population _has increased________ from 1.6 billion to 1.8 billion.中为什么要加has?（为什么要用现在完成时）
因为人口增长的状态是指的现在,所以用现在是,并且从过去到现在一直在持续增长,所以用完成时,两项加起来就是现在完成时,人口是单数,不可数,用has.
现在完成时表示动作从过去的某个时间一直延续到现在，并有可能继续下去。这里是人口从过去的1.6b增长到现在的1.8b，是一个过程，所以用has。
自己观点，望采纳，谢谢！
The population _has increased________ from 1.6 billion to 1.8 billion.中为什么要加has?（为什么要用现在完成时）
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