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求问这句英文的句子结构
A growing number of people have become fully aware that a global ecological crisis is just around the corner if we continue to neglect environmental protection.
主要是have become fully aware是怎么回事,为什么是become而不是became呢,这个到底是什么时态?
人气:443 ℃ 时间:2020-03-25 07:53:31
解答
have become fully aware,这个是标准的现在完成时
have + 过去分词,构成现在完成时
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