是的,此处使用的是现在完成时,表示动作已经发生在过去的某一时间,使用完成时是为了表示影响,该用法的现在完成时表示一个过去发生的动作在过去已经完成,并且这个过去发生并完成的动作对现在有影响或结果,同时说话者强调的或感兴趣的就是这个影响或结果.
Meanwhile,a number of university students have volunteered t
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