—When did the computer crash? — This mor
题型:选择题
问题:
— When did the computer crash?
— This morning, while I ______ the reading materials downloaded from some websites. [ ]
A. have sorted
B. was sorting
C. am sorting
D. had sorted
— When did the computer crash?
— This morning, while I ______ the reading materials downloaded from some websites. [ ]
A. have sorted
B. was sorting
C. am sorting
D. had sorted