He ___to the library everyday, but today he_______, because it ________
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In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. ... As there is no absolute frame of reference, absolute motion cannot be determined.
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has been working
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence. Option C)has been working is correct as present perfect continuous tense is used to indicate an action that something started in the past and is continued in the present time ("for the last five years").
The other options are incorrect as no other tense suits the sentence and the correct answer has already been chosen.
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