[ Grammar ]
In the vessels of the vascular system of the giraffe _____ of valves that ensures a needed supply of blood to the head.
A. are series
B. is seroius
C. is a series
D. a series is
Select your answer:
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Grammar › ViewThe English of Canada is similar to:
A. Australian and British English
B. French and American English
C. American and British English
D. Black and American English
Tenses › View
She ____ the cost of the project when we spoke.
A. was calculating
B. will calculate
C. calculates
D. is calculating