Which choice completes the text so that it conforms to the conventions of Standard English?
A
has entered
B
have entered
C
were entering
D
enter
Explanation
Correct answer: A.
Choice A is the best answer. The convention being tested is subject-verb agreement. The singular verb "has entered" agrees in number with the singular subject "an abstract cubist painting."
Why the other choices are wrong
Choice B
Choice B is incorrect because the plural verb "have entered" doesn’t agree in number with the singular subject "an abstract cubist painting."
Choice C
Choice C is incorrect because the plural verb "were entering" doesn’t agree in number with the singular subject "an abstract cubist painting."
Choice D
Choice D is incorrect because the plural verb "enter" doesn’t agree in number with the singular subject "an abstract cubist painting."