The Correct answer is A.
Explanation
The error in this sentence occurs at A. The present perfect phrase “has not … been” in the dependent clause beginning with “Although” is not consistent with the past tense verb “put” in the main clause. It should be replaced with the past perfect verb phrase “had not … been” to indicate how Mrs. Griffin felt “previously” — i.e. before she “put in extra time this year.”
Writing > Identifying Sentence Errors
The following sentence contains either a single error or no error at all. If the sentence contains an error, select the one underlined part that must be changed to make the sentence correct. If the sentence contains no error, select choice E.
Although Mrs. Griffin （A）has not previously been very enthusiastic about preparing her students （B）for the annual piano competition, she put in extra time this year （C）to ensure that her star pupil （D）would win first prize. （E）No error.
(A)
(B)
(C)
(D)
(E)
