the boy (read) the book for three hours
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The present perfect continuous tense (also known as the present perfect progressive tense) shows that something started in the past and is continuing at the present time. The present perfect continuous is formed using the construction has/have been + the present participle (root + -ing).
For the first blank, we are looking into something that has started happening and is still continuing. If we look into the formula Option A seems to be the correct answer.
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