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The old teacher lay wide awake on his bed, ___________ all t

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The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day.
A.thought about B.to think about C.thinking about D.having thought about
C

这位老教师在床上行者想着第二天不得不解决所有问题。考查分词作伴随状语。to do表目的结果,having done发生在位于动作之前。