8
Answer: CSet 16: Boundaries
Explanation
PASSAGE
The ancient manuscript, which remains controversial, _______ studied extensively.
Which choice completes the text so that it conforms to the conventions of Standard English?
A. have been
B. were
C. has been✓ Correct
D. being
Detailed Answer Explanation
The correct answer is 'has been' because of the rule: subject-verb agreement with singular subject.
Why others are wrong: A ('have been' violates the grammatical rule: subject-verb agreement with singular subject.), B ('were' violates the grammatical rule: subject-verb agreement with singular subject.), D ('being' violates the grammatical rule: subject-verb agreement with singular subject.).