Researchers studying the “terra-cotta army,” the thousands of life-size statues of warriors found interred near the tomb of
Emperor Qin Shi Huang of China, were shocked to realize that the shape of each statue’s ears, like the shape of each
person’s ears, ______ unique.
are
is
were
have been
Choice B is the best answer. The convention being tested is subject–verb agreement. because the singular verb “is” agrees
in number with the singular subject “the shape.”
Choice A is incorrect because the plural verb “are” doesn’t agree in number with the singular subject “the shape.” Choice C is
incorrect because the plural verb “were” doesn’t agree in number with the singular subject “the shape.” Choice D is incorrect
because the plural verb “have been” doesn’t agree in number with the singular subject “the shape.”