高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 yearsA,didB,have been doing C,had done D,were doing是7 hours,不是年= =

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高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 yearsA,didB,have been doing C,had done D,were doing是7 hours,不是年= =
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高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 yearsA,didB,have been doing C,had done D,were doing是7 hours,不是年= =
高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 years
A,didB,have been doing C,had done D,were doing
是7 hours,不是年= =

高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 yearsA,didB,have been doing C,had done D,were doing是7 hours,不是年= =
选 B ,现在完成进行时态,表示过去某个时刻开始的动作一直持续到现在并且有可能继续下去.医生们从7小时之前开始做手术一直到现在,还有可能继续.

答案是 B,have been doing

选B 这里有时间状语in the last/past+时间段，是现在完成时的标志，类似的时间状语还有since+时间点，for+时间段，by+一段时间，over+时间段。此题便是根据这个时间标志解出答案。楼主百度现在完成时的时间标志便可。

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