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Identify the sentence that correctly employs the present perfect continuous tense:
1
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Identify the sentence that correctly employs the present perfect continuous tense:
A
He has been studying English since 5 years.
B
They have waited for us since the morning.
C
She has been working here for over a decade.
D
I have lived in this city for three years.
E
We have been knowing each other since childhood.