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She was too tired to keep awake.She ___continuously since dawn.
A.worked B.had been working
C.had worked D.have been working
since后面用过去时，前面用现在完成时？
网校学员uoC**在学习英语零基础直达PETS三级/公共英语三级【开学季专享班】时提出了此问题，已有1人帮助了TA。
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Evelyn5422
同学你好，该知识点来自沪江网校《英语零基础直达PETS三级/公共英语三级【开学季专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学好~这道题应该是选B吧~
第一句是说，她（过去某时间）太累了，醒不过来。
然后第二句说的是她累的原因，她在这个太累的时间之前，从一大早就一直工作。因为是一直工作的状态，所以肯定是完成进行时，排除A、C。又因为这是一个典型的“过去的过去”的时间，所以用过去完成时had done，综合一下就是B had been working；
另外D选项除了时态不合适之外，如果是现在完成时，have要跟随主语she进行单三变化，应该是has。
希望帮到同学~
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英语零基础直达PETS三级/公共英语三级【开学季专享班】
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