Ⅱ. Vocabulary and Structure (15 points)
Directions: There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the Answer Sheet.
6. I ______ my work by this time yesterday evening.
A. did
B. would do
C. had done
正确答案：C
6．答案为C指到过去某叫为止的事情
