It was now six and he was tired because he ______since dawn.

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问题 It was now six and he was tired because he ______since dawn.

选项 A、has worked
B、had worked
C、worked
D、was working

答案B

解析这句话的意思是说，当时正是六点钟，他因为从黎明起就一直在工作而觉得很累。当从句的主句为一般过去时，且从句的动作先于主句的动作时，从句要用过去完成时，所以正确项是(B)。

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