单选题 请问选B还是选C?
Atthebeginningallthestudentskepttogetherbutbytheendofthedaythosewhowerelessfit____beh...
At the beginning all the students kept together but by the end of the day those who were less fit____ behind.
A. have fallen B. fell C. had fallen D. were falling 展开
A. have fallen B. fell C. had fallen D. were falling 展开
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