[ Vocabulary ]
Consultation and collaboration are essential components in a work place.
Essential means:
A. Necessary
B. Critical
C. Important
D. All the above

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Grammar › ViewDo you know the boy ….. is eating a pizza over there.
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Organisms living millions of years ago produced energy using retinal, which was _____ dark purple colour.
A. a
B. an
C. the
D. The
