Directions: In question some of the sentences have errors and some have none. Find out which part of a sentence has an error, and the appropriate letter $\text{(A, B, C)}$ is your answer. If there is no error, $\text{D}$ is the answer.
$\underset{\text{(A)}}{\text{We saw Julia last summer, /}} \underset{\text{(B)}}{\text{but we haven't /}} \underset{\text{(C)}}{\text{did seen her since. /}} \underset{\text{(D)}}{\text{No error}}$