Direction: In the following questions, sentences are given with blanks to be filled in with an appropriate word (s). Four alternatives are suggested for each question. Choose the correct alternative out of the four as your answer.
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I _____ hard to establish the validity of the theory since morning.
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- have been trying
- had tried
- tried
- am trying
- have been trying
Correct Option: A
Present Perfect Continuous Tense (have been trying) is the right usage.
