题目
现在完成时的时态标志.
提问时间：2021-03-17
答案
recently, recent years, these days/years, lately, since, for + 时段, in the past few years, ever since, in the last five months, up to now, since then, so far, ever, never, yet, lately, once, twice, three/four times..., already, before, just.
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