Look at the following sentence. Which of the al. ternatives below fills in the blanks correctly? Why and explain your answer with grammar.

Sheila (1) _______(2)_______that project (3)______.

A) (1) is working (2)in (3) since the beginning of the year

B) (1) has been working (2) on (3) since the beginning of the year.

C) (1) had been working (2) with (3) during 6 months

D) (1) has been working (2) on (3) since 6 months ago.
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