She has a headache because she______(看了太长时间的书).

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问题 She has a headache because she______(看了太长时间的书).

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答案has been reading too long

解析 “看了太长时间”表示在一段时间内无停顿地、一直在看,故用现在完成进行时,此处填has been reading too long。
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