By the time she ________ tomorrow, the work ________
A.arrives ; will be finished
B.arrives ; will have been finished
C.will arrive ; will have been finished
D.arrives ; will have finished
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B解析考查时态。By+将来的时间，主句用将来完成时；by+过去的时间，主句用过去完成时。By引导的从句用一般现在时代替将来时。work和finish主句是动宾关系，故用被动语态；再根据tomorrow可知，主句用将来完成时；综合用将来完成时的被动语态。句意“到明天她到达的时候，工作已经被做完了。”故选B。