Choose the right structure for Present perfect continuous tense.
a Subject + will have/shall have +verb (3rd form) + object.
b Subject + has/ have +verb (3rd form) + object.
c Subject + has/have + been +verb (ing form) + object + since/for + time.
d Subject + had been +verb (3rd form) + object + since/for + time.
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Answer:
it's C
Explanation:
Subject + has/have + been +verb (ing form) + object + since/for + time.
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