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

Вопрос школьника по предмету Английский язык

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

Ответ учителя по предмету Английский язык

А) has been observed