In recent decades, season creep ________, which means that many phenological signs of spring are occurring earlier in many regions by a couple of days per decade. А) has been observed Б) has observed В) was observe...

In recent decades, season creep ________, which means that many phenological signs of spring are occurring earlier in many regions by a couple of days per decade. А) has been observed Б) has observed В) was observed Г) is observed
Гость
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Гость
А) has been observed
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