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_____ a certain doubt among the workers as to whether he could finish the task in a short time．
A．It wasB．There hadC．There existedD．It had
C
There existed為there be句型的變體意為“有”。句意：關(guān)于他是否能在短時間內(nèi)完成這項任務在工人中存在著某種懷疑。
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