请问下面这句话的时态.

题目

请问下面这句话的时态.
today,foreign countries especially China and Japan have been willing to buy huge amounts of american debt even at low interest rates.
anyone who can offer furture explanation?thanks a lot!

答案

现在完成进行时
就是指不仅对现在有影响,将来还可能持续发生的行为
现在,一些国家,尤其是中国和日本,愿意大量持续购买甚至是低利率的美国债券.