THE WHEEL, ... HAS REMAINED IMPORTANT FOR 4,000 YEARS, IS ONE OF...
119. The wheel, ... has remained important for 4,000 years, is one of mankind's first
inventions.
a. how
b. when
c. which
d. about
119. The wheel, ... has remained important for 4,000 years, is one of mankind's first
inventions.
a. how
b. when
c. which
d. about