(A) Present Perfect Continuous Tense
(B) Future Perfect Continuous Tense
(C) Past Perfect Continuous Tense
(D) Present Perfect Tense
Answer: (A) Present Perfect Continuous Tense
(A) Present Perfect Continuous Tense
(B) Future Perfect Continuous Tense
(C) Past Perfect Continuous Tense
(D) Present Perfect Tense
Answer: (A) Present Perfect Continuous Tense