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They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.
A.had been working; are still workingB.had worked; were still working
C.have been working; have workedD.have worked; are still working
A
检查考生对动词时态的掌握和运用能力。第一空,时间状语从句before I joined them决定了要使用响应的过去时态;第二空,now 决定了要使用现在时态。
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