一道英语选择题,请说明为什么，谢谢。
Whilethecoldwintermornings_____thestudentslivingatschoolexercisingat6:50a.m.ontheplay...
While the cold winter mornings_____ the students living at school exercising at 6:50 a.m. on the playground, I am sleeping in bed dreaming.
A. saw B. see C. has seen D. was seen 展开
A. saw B. see C. has seen D. was seen 展开
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